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In the mathematical field of [[differential geometry]], a '''Cartan connection''' is a flexible generalization of the notion of an [[affine connection]]. It may also be regarded as a specialization of the general concept of a [[connection (principal bundle)|principal connection]], in which the geometry of the [[principal bundle]] is tied to the geometry of the base manifold using a [[solder form]]. Cartan connections describe the geometry of manifolds modelled on [[homogeneous space]]s. | |||
The theory of Cartan connections was developed by [[Élie Cartan]], as part of (and a way of formulating) his [[method of moving frames]] ('''repère mobile''').<ref>Although Cartan only began formalizing this theory in particular cases in the 1920s {{Harv|Cartan|1926}}, he made much use of the general idea much earlier. In particular, the high point of his remarkable 1910 paper on [[Pfaffian system]]s in five variables is the construction of a Cartan connection modelled on a 5-dimensional homogeneous space for the [[exceptional Lie group]] [[G2 (mathematics)|G<sub>2</sub>]], which he and Engels had discovered independently in 1894.</ref> The main idea is to develop a suitable notion of the [[connection form]]s and [[curvature]] using moving frames adapted to the particular geometrical problem at hand. For instance, in relativity or Riemannian geometry, [[orthonormal frame]]s are used to obtain a description of the [[Levi-Civita connection]] as a Cartan connection. For Lie groups, [[Maurer–Cartan form|Maurer–Cartan frame]]s are used to view the [[Maurer–Cartan form]] of the group as a Cartan connection. | |||
Cartan reformulated the differential geometry of ([[pseudo-Riemannian manifold|pseudo]]) [[Riemannian geometry]], as well as the differential geometry of [[manifold]]s equipped with some non-metric structure, including [[Lie group]]s and [[homogeneous space]]s. The term Cartan connection most often refers to Cartan's formulation of a (pseudo-)Riemannian, [[affine connection|affine]], [[projective connection|projective]], or [[conformal connection]]. Although these are the most commonly used Cartan connections, they are special cases of a more general concept. | |||
Cartan's approach seems at first to be coordinate dependent because of the choice of frames it involves. However, it is not, and the notion can be described precisely using the language of principal bundles. Cartan connections induce covariant derivatives and other differential operators on certain associated bundles, hence a notion of parallel transport. They have many applications in geometry and physics: see the [[method of moving frames]], [[Cartan connection applications]] and [[Einstein–Cartan theory]] for some examples. | |||
==Introduction== | |||
At its roots, geometry consists of a notion of ''congruence'' between different objects in a space. In the late 19th century, notions of congruence were typically supplied by the action of a [[Lie group]] on space. Lie groups generally act quite rigidly, and so a Cartan geometry is a generalization of this notion of congruence to allow for [[curvature]] to be present. The ''flat'' Cartan geometries — those with zero curvature — are locally equivalent to homogeneous spaces, hence geometries in the sense of Klein. | |||
A [[Klein geometry]] consists of a Lie group ''G'' together with a Lie subgroup ''H'' of ''G''. Together ''G'' and ''H'' determine a [[homogeneous space]] ''G''/''H'', on which the group ''G'' acts by left-translation. Klein's aim was then to study objects living on the homogeneous space which were ''congruent'' by the action of ''G''. A Cartan geometry extends the notion of a Klein geometry by attaching to each point of a [[manifold]] a copy of a Klein geometry, and to regard this copy as ''tangent'' to the manifold. Thus the geometry of the manifold is ''infinitesimally'' identical to that of the Klein geometry, but globally can be quite different. In particular, Cartan geometries no longer have a well-defined action of ''G'' on them. However, a '''Cartan connection''' supplies a way of connecting the infinitesimal model spaces within the manifold by means of [[parallel transport]]. | |||
===Motivation=== | |||
Consider a smooth surface ''S'' in 3-dimensional Euclidean space '''R'''<sup>3</sup>. Near to any point, ''S'' can be approximated by its tangent plane at that point, which is an [[affine subspace]] of Euclidean space. The affine subspaces are ''model'' surfaces — they are the simplest surfaces in '''R'''<sup>3</sup>, and are homogeneous under the Euclidean group of the plane, hence they are ''Klein geometries'' in the sense of [[Felix Klein]]'s [[Erlangen programme]]. Every smooth surface ''S'' has a unique affine plane tangent to it at each point. The family of all such planes in '''R'''<sup>3</sup>, one attached to each point of ''S'', is called the '''congruence''' of tangent planes. A tangent plane can be "rolled" along ''S'', and as it does so the point of contact traces out a curve on ''S''. Conversely, given a curve on ''S'', the tangent plane can be rolled along that curve. This provides a way to identify the tangent planes at different points along the curve by affine (in fact Euclidean) transformations, and is an example of a Cartan connection called an [[affine connection]]. | |||
Another example is obtained by replacing the planes, as model surfaces, by spheres, which are homogeneous under the Möbius group of conformal transformations. There is no longer a unique sphere tangent to a smooth surface ''S'' at each point, since the radius of the sphere is undetermined. This can be fixed by supposing that the sphere has the same [[mean curvature]] as ''S'' at the point of contact. Such spheres can again be rolled along curves on ''S'', and this equips ''S'' with another type of Cartan connection called a [[conformal connection]]. | |||
Differential geometers in the late 19th and early 20th century were very interested in using model families such as planes or spheres to describe the geometry of surfaces. A family of model spaces attached to each point of a surface ''S'' is called a '''congruence''': in the previous examples there is a canonical choice of such a congruence. A Cartan connection provides an identification between the model spaces in the congruence along any curve in ''S''. An important feature of these identifications is that the point of contact of the model space with ''S'' ''always moves'' with the curve. This generic condition is characteristic of Cartan connections. | |||
In the modern treatment of affine connections, the point of contact is viewed as the ''origin'' in the tangent plane (which is then a vector space), and the movement of the origin is corrected by a translation, and so Cartan connections are not needed. However, there is no canonical way to do this in general: in particular for the conformal connection of a sphere congruence, it is not possible to separate the motion of the point of contact from the rest of the motion in a natural way. | |||
In both of these examples the model space is a homogeneous space ''G''/''H''. | |||
* In the first case, ''G''/''H'' is the affine plane, with ''G'' = Aff('''R'''<sup>2</sup>) the [[affine group]] of the plane, and ''H'' = GL(2) the corresponding general linear group. | |||
* In the second case, ''G''/''H'' is the conformal (or [[celestial sphere|celestial]]) sphere, with ''G'' = O<sup>''+''</sup>(3,1) the [[Lorentz group|(orthochronous) Lorentz group]], and ''H'' the [[Group_action#Orbits and stabilizers|stabilizer]] of a null line in '''R'''<sup>3,1</sup>. | |||
The Cartan geometry of ''S'' consists of a copy of the model space ''G''/''H'' at each point of ''S'' (with a marked point of contact) together with a notion of "parallel transport" along curves which identifies these copies using elements of ''G''. This notion of parallel transport is generic in the intuitive sense that the point of contact always moves along the curve. | |||
In general, let ''G'' be a group with a subgroup ''H'', and ''M'' a manifold of the same dimension as ''G''/''H''. Then, roughly speaking, a Cartan connection on ''M'' is a ''G''-connection which is generic with respect to a reduction to ''H''. | |||
===Affine connections=== | |||
{{main|Affine connection}} | |||
An '''[[affine connection]]''' on a manifold ''M'' is a [[connection (principal bundle)]] on the [[frame bundle]] of ''M'' (or equivalently, a [[connection (vector bundle)]] on the [[tangent bundle]] of ''M''). A key aspect of the Cartan connection point of view is to elaborate this notion in the context of [[principal bundle]]s (which could be called the "general or abstract theory of frames"). | |||
Let ''H'' be a [[Lie group]]. Then a '''principal ''H''-bundle''' is a [[fiber bundle]] ''P'' over ''M'' with a smooth [[group action|action]] of ''H'' on ''P'' which is free and transitive on the fibers. Thus ''P'' is a smooth manifold with a smooth map ''π'': ''P'' → ''M'' which looks ''locally'' like the [[trivial bundle]] ''M'' × ''H'' → ''M''. The frame bundle of ''M'' is a principal GL(''n'')-bundle, while if ''M'' is a [[Riemannian manifold]], then the [[orthonormal frame bundle]] is a principal O(''n'')-bundle. | |||
Let ''R''<sub>''h''</sub> denote the (right) action of ''h'' ∈ H on ''P''. The derivative of this action defines a '''[[vertical bundle|vertical vector]] field''' on ''P'' for each element ''ξ'' of <math>\mathfrak h</math>: if ''h''(''t'') is a 1-parameter subgroup with ''h''(0)=''e'' (the identity element) and ''h'' '(''0'')=''ξ'', then the corresponding vertical vector field is | |||
:<math>X_\xi=\frac{\mathrm d}{\mathrm dt}R_{h(t)}\biggr|_{t=0}.\,</math> | |||
A '''principal ''H''-connection''' on ''P'' is a [[differential 1-form|1-form]] <math>\omega\colon TP\to \mathfrak h</math> on ''P'', | |||
with values in the [[Lie algebra]] <math>\mathfrak h</math> of ''H'', such that | |||
# <math>\hbox{Ad}(h)(R_h^*\omega)=\omega</math> | |||
# for any <math>\xi\in \mathfrak h</math>, ''ω''(''X''<sub>''ξ''</sub>) = ''ξ'' (identically on ''P''). | |||
The intuitive idea is that ''ω''(''X'') provides a ''vertical component'' of ''X'', using the isomorphism of the fibers of ''π'' with ''H'' to identify vertical vectors with elements of <math>\mathfrak h</math>. | |||
Frame bundles have additional structure called the [[solder form]], which can be used to extend a principal connection on ''P'' to a trivialization of the tangent bundle of ''P'' called an '''absolute parallelism'''. | |||
In general, suppose that ''M'' has dimension ''n'' and ''H'' acts on '''R'''<sup>''n''</sup> (this could be any ''n''-dimensional real vector space). A '''solder form''' on a principal ''H''-bundle ''P'' over ''M'' is an '''R'''<sup>''n''</sup>-valued 1-form ''θ'': T''P'' → '''R'''<sup>''n''</sup> which is horizontal and equivariant so that it induces a [[bundle homomorphism]] from T''M'' to the [[associated bundle]] ''P'' ×<sub>''H''</sup> '''R'''<sup>''n''</sup>. This is furthermore required to be a bundle isomorphism. Frame bundles have a (canonical or tautological) solder form which sends a tangent vector ''X'' ∈ T<sub>''p''</sub>''P'' to the coordinates of d''π''<sub>''p''</sub>(''X'') ∈ T<sub>''π''(''p'')</sub>''M'' with respect to the frame ''p''. | |||
The pair (''ω'', ''θ'') (a principal connection and a solder form) defines a 1-form ''η'' on ''P'', with values in the Lie algebra <math>\mathfrak g</math> of the [[semidirect product]] ''G'' of ''H'' with '''R'''<sup>''n''</sup>, which provides an isomorphism of each tangent space T<sub>''p''</sub>''P'' with <math>\mathfrak g</math>. It induces a principal connection ''α'' on the associated principal ''G''-bundle ''P'' ×<sub>''H''</sub> ''G''. This is a Cartan connection. | |||
Cartan connections generalize affine connections in two ways. | |||
* The action of ''H'' on '''R'''<sup>''n''</sup> need not be effective. This allows, for example, the theory to include spin connections, in which ''H'' is the [[spin group]] Spin(''n'') rather than the [[orthogonal group]] O(''n''). | |||
* The group ''G'' need not be a semidirect product of ''H'' with '''R'''<sup>''n''</sup>. | |||
===Klein geometries as model spaces=== | |||
Klein's [[Erlangen programme]] suggested that geometry could be regarded as a study of [[homogeneous space]]s: in particular, it is the study of the many geometries of interest to geometers of 19th century (and earlier). A Klein geometry consisted of a space, along with a law for motion within the space (analogous to the [[Euclidean transformation]]s of classical [[Euclidean geometry]]) expressed as a [[Lie group]] of [[transformation group|transformations]]. These generalized spaces turn out to be homogeneous [[smooth manifold]]s diffeomorphic to the [[quotient space]] of a Lie group by a [[Lie subgroup]]. The extra differential structure that these homogeneous spaces possess allows one to study and generalize their geometry using calculus. | |||
The general approach of Cartan is to begin with such a ''smooth Klein geometry'', given by a Lie group ''G'' and a Lie subgroup ''H'', with associated Lie algebras <math>\mathfrak g</math> and <math>\mathfrak h</math>, respectively. Let ''P'' be the underlying [[principal homogeneous space]] of ''G''. A Klein geometry is the homogeneous space given by the quotient ''P''/''H'' of ''P'' by the right action of ''H''. There is a right ''H''-action on the fibres of the canonical projection | |||
:''π'': ''P'' → ''P''/''H'' | |||
given by ''R''<sub>''h''</sub>''g'' = ''gh''. Moreover, each [[fibre bundle|fibre]] of ''π'' is a copy of ''H''. ''P'' has the structure of a [[principal bundle|principal ''H''-bundle]] over ''P''/''H''.<ref>{{Harvnb|Chevalley|1946| p=110}}.</ref> | |||
A vector field ''X'' on ''P'' is ''vertical'' if d''π''(''X'') = 0. Any ''ξ'' ∈ <math>\mathfrak h </math> gives rise to a canonical vertical vector field ''X''<sub>''ξ''</sub> by taking the derivative of the right action of the 1-parameter subgroup of ''H'' associated to ξ. The [[Maurer-Cartan form]] ''η'' of ''P'' is the <math>\mathfrak g</math>[[Lie algebra-valued form|-valued one-form]] on ''P'' which identifies each tangent space with the Lie algebra. It has the following properties: | |||
# Ad(''h'') ''R''<sub>''h''</sub><sup>*</sup>''η'' = ''η'' for all ''h'' in ''H'' | |||
# ''η''(''X''<sub>''ξ''</sub>) = ''ξ'' for all ''ξ'' in <math>\mathfrak h</math> | |||
# for all ''g''∈''P'', ''η'' restricts a linear isomorphism of T<sub>''g''</sub>''P'' with <math>\mathfrak g</math> (η is an '''absolute parallelism''' on ''P''). | |||
In addition to these properties, ''η'' satisfies the '''structure''' (or '''structural''') '''equation''' | |||
: <math> d\eta+\tfrac{1}{2}[\eta,\eta]=0. </math> | |||
Conversely, one can show that given a manifold ''M'' and a principal ''H''-bundle ''P'' over ''M'', and a 1-form ''η'' with these properties, then ''P'' is locally isomorphic as an ''H''-bundle to the principal homogeneous bundle ''G''→''G''/''H''. The structure equation is the [[integrability condition]] for the existence of such a local isomorphism. | |||
A Cartan geometry is a generalization of a smooth Klein geometry, in which the structure equation is not assumed, but is instead used to define a notion of [[curvature]]. Thus the Klein geometries are said to be the '''flat models''' for Cartan geometries.<ref>See R. Hermann (1983), Appendix 1–3 to {{Harvtxt|Cartan|1951}}.</ref> | |||
== Cartan connections and pseudogroups == | |||
Cartan connections are closely related to [[pseudogroup]] structures on a manifold. Each is thought of as ''modelled on'' a Klein geometry ''G''/''H'', in a manner similar to the way in which [[Riemannian geometry]] is modelled on [[Euclidean space]]. On a manifold ''M'', one imagines attaching to each point of ''M'' a copy of the model space ''G''/''H''. The symmetry of the model space is then built into the Cartan geometry or pseudogroup structure by positing that the model spaces of nearby points are related by a transformation in ''G''. The fundamental difference between a Cartan geometry and pseudogroup geometry is that the symmetry for a Cartan geometry relates ''infinitesimally'' close points by an ''infinitesimal'' transformation in ''G'' (i.e., an element of the Lie algebra of ''G'') and the analogous notion of symmetry for a pseudogroup structure applies for points that are physically separated within the manifold. | |||
The process of attaching spaces to points, and the attendant symmetries, can be concretely realized by using special [[coordinate system]]s.<ref>This appears to be Cartan's way of viewing the connection. Cf. {{Harvnb|Cartan|1923|p=362}}; {{Harvnb|Cartan|1924|p=208}} especially ''..un repère définissant un système de coordonnées projectives...''; {{Harvnb|Cartan|1951|p=34}}. Modern readers can arrive at various interpretations of these statements, cf. Hermann's 1983 notes in {{Harvnb|Cartan|1951|pp=384–385, 477}}.</ref> To each point ''p'' ∈ ''M'', a [[neighbourhood (mathematics)|neighborhood]] ''U''<sub>p</sub> of ''p'' is given along with a mapping φ<sub>p</sub> : ''U''<sub>p</sub> → ''G''/''H''. In this way, the model space is attached to each point of ''M'' by realizing ''M'' locally at each point as an open subset of ''G''/''H''. We think of this as a family of coordinate systems on ''M'', parametrized by the points of ''M''. Two such parametrized coordinate systems φ and φ′ are ''H''-related if there is an element ''h''<sub>p</sub> ∈ ''H'', parametrized by ''p'', such that | |||
: φ′<sub>p</sub> = ''h''<sub>p</sub> φ<sub>p</sub>.<ref>More precisely, ''h''<sub>p</sub> is required to be in the [[isotropy group]] of φ<sub>p</sub>(''p''), which is a group in ''G'' isomorphic to ''H''.</ref> | |||
This freedom corresponds roughly to the physicists' notion of a [[gauge fixing|gauge]]. | |||
Nearby points are related by joining them with a curve. Suppose that ''p'' and ''p''′ are two points in ''M'' joined by a curve ''p''<sub>t</sub>. Then ''p''<sub>t</sub> supplies a notion of transport of the model space along the curve.<ref>In general, this is not the rolling map described in the motivation, although it is related.</ref> Let τ<sub>t</sub> : ''G''/''H'' → ''G''/''H'' be the (locally defined) composite map | |||
:τ<sub>t</sub> = φ<sub>p<sub>t</sub></sub> o φ<sub>p<sub>0</sub></sub><sup>-1</sup>. | |||
Intuitively, τ<sub>t</sub> is the transport map. A pseudogroup structure requires that τ<sub>t</sub> be a ''symmetry of the model space'' for each ''t'': τ<sub>t</sub> ∈ ''G''. A Cartan connection requires only that the [[derivative]] of τ<sub>t</sub> be a symmetry of the model space: τ′<sub>0</sub> ∈ '''g''', the Lie algebra of ''G''. | |||
Typical of Cartan, one motivation for introducing the notion of a Cartan connection was to study the properties of pseudogroups from an infinitesimal point of view. A Cartan connection defines a pseudogroup precisely when the derivative of the transport map τ′ can be [[integral|integrated]], thus recovering a true (''G''-valued) transport map between the coordinate systems. There is thus an [[integrability condition]] at work, and Cartan's method for realizing integrability conditions was to introduce a [[differential form]]. | |||
In this case, τ′<sub>0</sub> defines a differential form at the point ''p'' as follows. For a curve γ(''t'') = ''p''<sub>t</sub> in ''M'' starting at ''p'', we can associate the [[tangent vector]] ''X'', as well as a transport map τ<sub>t</sub><sup>γ</sup>. Taking the derivative determines a linear map | |||
: <math> X \mapsto \left.\frac{d}{dt}\tau_t^\gamma\right|_{t=0} = \theta(X) \in \mathfrak{g}.</math> | |||
So θ defines a '''g'''-valued differential 1-form on ''M''. | |||
This form, however, is dependent on the choice of parametrized coordinate system. If ''h'' : ''U'' → ''H'' is an ''H''-relation between two parametrized coordinate systems φ and φ′, then the corresponding values of θ are also related by | |||
:<math>\theta^\prime_p = Ad(h^{-1}_p)\theta_p + h^*_p\omega_H,</math> | |||
where ω<sub>H</sub> is the Maurer-Cartan form of ''H''. | |||
==Formal definition== | |||
A Cartan geometry modelled on a homogeneous space ''G''/''H'' can be viewed as a ''deformation'' of this geometry which allows for the presence of ''curvature''. For example: | |||
* a [[Riemannian geometry|Riemannian manifold]] can be seen as a deformation of [[Euclidean space]]; | |||
* a [[Lorentzian manifold]] can be seen as a deformation of [[Minkowski space]]; | |||
* a [[conformal geometry|conformal manifold]] can be seen as a deformation of the [[conformal geometry|conformal sphere]]; | |||
* a manifold equipped with an [[affine connection]] can be seen as a deformation of an [[affine space]]. | |||
There are two main approaches to the definition. In both approaches, ''M'' is a smooth manifold of dimension ''n'', ''H'' is a Lie group of dimension ''m'', with Lie algebra <math>\mathfrak h</math>, and ''G'' is a Lie group ''G'' of dimension ''n''+''m'', with Lie algebra <math>\mathfrak g</math>, containing ''H'' as a subgroup. | |||
===Definition via gauge transitions=== | |||
A '''Cartan connection''' consists<ref>{{Harvnb|Sharpe|1997}}.</ref><ref>{{Harvnb|Lumiste|2001a}}.</ref> of a [[atlas (topology)|coordinate atlas]] of open sets ''U'' in ''M'', along with a '''g'''-valued 1-form θ<sub>U</sub> defined on each chart such that | |||
# θ<sub>U</sub> : T''U'' → '''g'''. | |||
# θ<sub>U</sub> mod '''h''' : T<sub>u</sub>''U'' → '''g'''/'''h''' is a linear isomorphism for every ''u'' ∈ ''U''. | |||
#For any pair of charts ''U'' and ''V'' in the atlas, there is a smooth mapping ''h'' : ''U'' ∩ ''V'' → ''H'' such that | |||
::<math>\theta_V = Ad(h^{-1})\theta_U + h^*\omega_H,\,</math> | |||
:where ω<sub>H</sub> is the [[Maurer-Cartan form]] of ''H''. | |||
By analogy with the case when the θ<sub>U</sub> came from coordinate systems, condition 3 means that φ<sub>U</sub> is related to φ<sub>V</sub> by ''h''. | |||
The curvature of a Cartan connection consists of a system of 2-forms defined on the charts, given by | |||
:<math>\Omega_U = d\theta_U + \tfrac{1}{2}[\theta_U,\theta_U].</math> | |||
Ω<sub>U</sub> satisfy the compatibility condition: | |||
:If the forms θ<sub>U</sub> and θ<sub>V</sub> are related by a function ''h'' : ''U'' ∩ ''V'' → ''H'', as above, then Ω<sub>V</sub> = Ad(''h''<sup>-1</sup>) Ω<sub>U</sub> | |||
The definition can be made independent of the coordinate systems by forming the [[quotient space]] | |||
:<math>P = (\coprod_U U\times H)/\sim</math> | |||
of the disjoint union over all ''U'' in the atlas. The [[equivalence relation]] ~ is defined on pairs (''x'',''h''<sub>1</sub>) ∈ ''U''<sub>1</sub> × ''H'' and (''x'', ''h''<sub>2</sub>) ∈ ''U''<sub>2</sub> × ''H'', by | |||
:(''x'',''h''<sub>1</sub>) ~ (''x'', ''h''<sub>2</sub>) if and only if ''x'' ∈ ''U''<sub>1</sub> ∩ ''U''<sub>2</sub>, θ<sub>''U''<sub>1</sub></sub> is related to θ<sub>''U''<sub>2</sub></sub> by ''h'', and ''h''<sub>2</sub> = ''h''(''x'')<sup>-1</sup> ''h''<sub>1</sub>. | |||
Then ''P'' is a [[principal bundle|principal ''H''-bundle]] on ''M'', and the compatibility condition on the connection forms θ<sub>U</sub> implies that they lift to a '''g'''-valued 1-form η defined on ''P'' (see below). | |||
===Definition via absolute parallelism=== | |||
Let ''P'' be a principal ''H'' bundle over ''M''. Then a '''Cartan connection'''<ref>This is the standard definition. Cf. Hermann (1983), Appendix 2 to {{Harvnb|Cartan|1951}}; {{Harvnb|Kobayashi|1970| p=127}}; {{Harvnb|Sharpe|1997}}; {{Harvnb|Slovák|1997}}.</ref> is a <math>\mathfrak g</math>-valued 1-form ''η'' on ''P'' such that | |||
# for all ''h'' in ''H'', Ad(''h'')''R''<sub>''h''</sub><sup>*</sup>''η'' = ''η'' | |||
# for all ''ξ'' in <math>\mathfrak h</math>, ''η''(''X''<sub>''ξ''</sub>) = ''ξ'' | |||
# for all ''p'' in ''P'', the restriction of ''η'' defines a linear isomorphism from the tangent space T<sub>''p''</sub>''P'' to <math>\mathfrak g</math>. | |||
The last condition is sometimes called the '''Cartan condition''': it means that ''η'' defines an '''absolute parallelism''' on ''P''. The second condition implies that ''η'' is already injective on vertical vectors and that the 1-form ''η'' mod <math>\mathfrak h</math>, with values in <math>\mathfrak g/\mathfrak h</math>, is horizontal. The vector space <math>\mathfrak g/\mathfrak h</math> is a [[group representation|representation]] of ''H'' using the adjoint representation of ''H'' on <math>\mathfrak g</math>, and the first condition implies that ''η'' mod <math>\mathfrak h</math> is equivariant. Hence it defines a bundle homomorphism from T''M'' to the associated bundle <math> P\times_H \mathfrak g/\mathfrak h</math>. | |||
The Cartan condition is equivalent to this bundle homomorphism being an isomorphism, so that ''η'' mod <math>\mathfrak h</math> is a [[solder form]]. | |||
The '''curvature''' of a Cartan connection is the <math>\mathfrak g</math>-valued 2-form ''Ω'' defined by | |||
:<math>\Omega=d\eta+\tfrac{1}{2}[\eta\wedge\eta].</math> | |||
Note that this definition of a Cartan connection looks very similar to that of a [[principal connection]]. There are several important differences, however. First, the 1-form η takes values in '''g''', but is only equivariant under the action of ''H''. Indeed, it cannot be equivariant under the full group ''G'' because there is no ''G'' bundle and no ''G'' action. Secondly, the 1-form is an absolute parallelism, which intuitively means that η yields information about the behavior of additional directions in the principal bundle (rather than simply being a projection operator onto the vertical space). Concretely, the existence of a solder form binds (or solders) the Cartan connection to the underlying [[differential topology]] of the manifold. | |||
<!-- Clean this up, please. --> | |||
An intuitive interpretation of the Cartan connection in this form is that it determines a ''fracturing'' of the tautological principal bundle associated to a Klein geometry. Thus Cartan geometries are deformed analogues of Klein geometries. This deformation is roughly a prescription for attaching a copy of the model space ''G''/''H'' to each point of ''M'' and thinking of that model space as being ''tangent'' to (and ''infinitesimally identical'' with) the manifold at a point of contact. The fibre of the tautological bundle ''G'' → ''G''/''H'' of the Klein geometry at the point of contact is then identified with the fibre of the bundle ''P''. Each such fibre (in ''G'') carries a Maurer-Cartan form for ''G'', and the Cartan connection is a way of assembling these Maurer-Cartan forms gathered from the points of contact into a coherent 1-form η defined on the whole bundle. The fact that only elements of ''H'' contribute to the Maurer-Cartan equation Ad(''h'')''R''<sub>''h''</sub><sup>*</sup>''η'' = ''η'' has the intuitive interpretation that any other elements of ''G'' would move the model space away from the point of contact, and so no longer be tangent to the manifold. | |||
From the Cartan connection, defined in these terms, one can recover a Cartan connection as a system of 1-forms on the manifold (as in the gauge definition) by taking a collection of [[locally trivial|local trivializations]] of ''P'' given as sections ''s''<sub>U</sub> : ''U'' → ''P'' and letting θ<sub>U</sub> = ''s''<sup>*</sup>η be the [[pullback (differential geometry)|pullbacks]] of the Cartan connection along the sections. | |||
===Cartan connections as principal connections=== | |||
Another way in which to define a Cartan connection is as a [[connection (principal bundle)|principal connection]] on a certain principal ''G''-bundle. From this perspective, a Cartan connection consists of | |||
* a principal ''G''-bundle ''Q'' over ''M'' | |||
* a principal ''G''-connection ''α'' on ''Q'' (the Cartan connection) | |||
* a principal ''H''-subbundle ''P'' of ''Q'' (i.e., a reduction of structure group) | |||
such that the [[pullback (differential geometry)|pullback]] ''η'' of ''α'' to ''P'' satisfies the Cartan condition. | |||
The principal connection ''α'' on ''Q'' can be recovered from the form ''η'' by taking ''Q'' to be the associated bundle ''P'' ×<sub>''H''</sub> ''G''. Conversely, the form η can be recovered from α by pulling back along the inclusion ''P'' ⊂ ''Q''. | |||
Since ''α'' is a principal connection, it induces a [[Ehresmann connection|connection]] on any [[associated bundle]] to ''Q''. In particular, the bundle ''Q'' ×<sub>''G''</sub> ''G''/''H'' of homogeneous spaces over ''M'', whose fibers are copies of the model space ''G''/''H'', has a connection. The reduction of structure group to ''H'' is equivalently given by a section ''s'' of ''E'' = ''Q'' ×<sub>''G''</sub> ''G''/''H''. The fiber of <math>P\times_H \mathfrak g/\mathfrak h</math> over ''x'' in ''M'' may be viewed as the tangent space at ''s''(''x'') to the fiber of ''Q'' ×<sub>''G''</sub> ''G''/''H'' over ''x''. Hence the Cartan condition has the intuitive interpretation that the model spaces are tangent to ''M'' along the section ''s''. Since this identification of tangent spaces is induced by the connection, the marked points given by ''s'' always move under parallel transport. | |||
=== Definition by an Ehresmann connection === | |||
Yet another way to define a Cartan connection is with an [[Ehresmann connection]] on the bundle ''E'' = ''Q'' ×<sub>''G''</sub> ''G''/''H'' of the preceding section.<ref>{{Harvnb|Ehresmann|1950}}, {{Harvnb|Kobayashi|1957}}, {{Harvnb|Lumiste|2001b}}.</ref> A Cartan connection then consists of | |||
*A [[fibre bundle]] π : ''E'' → ''M'' with fibre ''G''/''H'' and vertical space V''E'' ⊂ T''E''. | |||
*A section ''s'' : ''M'' → ''E''. | |||
*A [[Ehresmann connection#Associated bundles|G-connection]] θ : T''E'' → V''E'' such that | |||
::''s''<sup>*</sup>θ<sub>x</sub> : T<sub>x</sub>''M'' → V<sub>''s''(''x'')</sub>''E'' is a linear isomorphism of vector spaces for all ''x'' ∈ ''M''. | |||
This definition makes rigorous the intuitive ideas presented in the introduction. First, the preferred section ''s'' can be thought of as identifying a point of contact between the manifold and the tangent space. The last condition, in particular, means that the tangent space of ''M'' at ''x'' is isomorphic to the tangent space of the model space at the point of contact. So the model spaces are, in this way, tangent to the manifold. | |||
[[Image:Model space development.svg|right|thumb|Development of a curve into the model space at ''x''<sub>0</sub>]] | |||
This definition also brings prominently into focus the idea of [[Development (differential geometry)|development]]. If ''x''<sub>t</sub> is a curve in ''M'', then the Ehresmann connection on ''E'' supplies an associated [[parallel transport]] map τ<sub>t</sub> : ''E''<sub>x<sub>t</sub></sub> → ''E''<sub>x<sub>0</sub></sub> from the fibre over the endpoint of the curve to the fibre over the initial point. In particular, since ''E'' is equipped with a preferred section ''s'', the points ''s''(''x''<sub>t</sub>) transport back to the fibre over ''x''<sub>0</sub> and trace out a curve in ''E''<sub>x<sub>0</sub></sub>. This curve is then called the ''development'' of the curve ''x''<sub>t</sub>. | |||
To show that this definition is equivalent to the others above, one must introduce a suitable notion of a [[moving frame]] for the bundle ''E''. In general, this is possible for any ''G''-connection on a fibre bundle with structure group ''G''. See [[Ehresmann connection#Associated bundles]] for more details. | |||
== Special Cartan connections == | |||
=== Reductive Cartan connections === | |||
Let ''P'' be a principal ''H''-bundle on ''M'', equipped with a Cartan connection η : T''P'' → '''g'''. If '''g''' is a [[reductive Lie algebra|reductive module]] for ''H'', meaning that '''g''' admits an Ad(''H'')-invariant splitting of vector spaces '''g'''='''h'''⊕'''m''', then the '''m'''-component of η generalizes the solder form for an [[affine connection]].<ref>For a treatment of affine connections from this point of view, see {{Harvtxt|Kobayashi|Nomizu|1996|loc= Volume 1}}.</ref> | |||
In detail, η splits into '''h''' and '''m''' components: | |||
:η = η<sub>'''h'''</sub> + η<sub>'''m'''</sub>. | |||
Note that the 1-form η<sub>'''h'''</sub> is a principal ''H''-connection on the original Cartan bundle ''P''. Moreover, the 1-form η<sub>'''m'''</sub> satisfies: | |||
:η<sub>'''m'''</sub>(''X'') = 0 for every vertical vector ''X'' ∈ T''P''. (η<sub>'''m'''</sub> is ''horizontal''.) | |||
:R<sub>h</sub><sup>*</sup>η<sub>'''m'''</sub> = Ad(''h''<sup>-1</sup>)η<sub>'''m'''</sub> for every ''h'' ∈ ''H''. (η<sub>'''m'''</sub> is ''equivariant'' under the right ''H''-action.) | |||
In other words, η is a [[solder form]] for the bundle ''P''. | |||
Hence, ''P'' equipped with the form η<sub>'''m'''</sub> defines a (first order) [[G-structure|''H''-structure]] on ''M''. The form η<sub>'''h'''</sub> defines a connection on the ''H''-structure. | |||
=== Parabolic Cartan connections === | |||
If '''g''' is a [[semisimple Lie algebra]] with [[parabolic Lie algebra|parabolic subalgebra]] '''p''' (i.e., '''p''' contains a [[Borel subalgebra|maximal solvable subalgebra]] of '''g''') and ''G'' and ''P'' are associated Lie groups, then a Cartan connection modelled on (''G'',''P'','''g''','''p''') is called a '''parabolic Cartan geometry''', or simply a '''parabolic geometry'''. A distinguishing feature of parabolic geometries is a Lie algebra structure on its [[cotangent space]]s: this arises because the perpendicular subspace '''p'''<sup>⊥</sup> of '''p''' in '''g''' with respect to the [[Killing form]] of '''g''' is a subalgebra of '''p''', and the Killing form induces a natural duality between '''p'''<sup>⊥</sup> and '''g'''/'''p'''. Thus the bundle associated to '''p'''<sup>⊥</sup> is isomorphic to the [[cotangent bundle]]. | |||
Parabolic geometries include many of those of interest in research and applications of Cartan connections, such as the following examples: | |||
* [[Conformal connection]]s: Here ''G'' = ''SO''(''p''+1,''q''+1), and ''P'' is the stabilizer of a null ray in '''R'''<sup>n+2</sup>. | |||
* [[Projective connection]]s: Here ''G'' = ''PGL''(n+1) and ''P'' is the stabilizer of a point in '''RP'''<sup>n</sup>. | |||
* [[CR structure]]s and Cartan-Chern-Tanaka connections: ''G'' = ''PSU''(''p''+1,''q''+1), ''P'' = stabilizer of a point on the projective null [[quadric|hyperquadric]]. | |||
* Contact projective connections:<ref>See, for example, {{harvtxt|Fox|2005}}.</ref> Here ''G'' = ''SP''(2n+2) and ''P'' is the stabilizer of the ray generated by the first standard basis vector in '''R'''<sup>n+2</sup>. | |||
* Generic rank 2 distributions on 5-manifolds: Here ''G'' = ''Aut''('''O'''<sub>s</sub>) is the automorphism group of the algebra '''O'''<sub>s</sub> of [[split octonion]]s, a [[closed subgroup]] of ''SO''(3,4), and ''P'' is the intersection of G with the stabilizer of the isotropic line spanned by the first standard basis vector in '''R'''<sup>7</sup> viewed as the purely imaginary split octonions (orthogonal complement of the unit element in '''O'''<sub>s</sub>).<ref>{{harvnb|Sagerschnig|2006}}; {{harvnb|Cap|Sagerschnig|2007}}.</ref> | |||
==Associated differential operators== | |||
===Covariant differentiation=== | |||
Suppose that ''M'' is a Cartan geometry modelled on ''G''/''H'', and let (''Q'',''α'') be the principal ''G''-bundle with connection, and (''P'',''η'') the corresponding reduction to ''H'' with ''η'' equal to the pullback of ''α''. Let ''V'' a [[group representation|representation]] of ''G'', and form the vector bundle '''V''' = ''Q'' ×<sub>''G''</sub> ''V'' over ''M''. Then the principal ''G''-connection ''α'' on ''Q'' induces a [[connection (vector bundle)|covariant derivative]] on '''V''', which is a first order [[linear differential operator]] | |||
:<math>\nabla\colon \Omega^0_M(\mathbf V)\to \Omega^1_M(\mathbf V),</math> | |||
where <math>\Omega^k_M(\mathbf V)</math> denotes the space of [[vector valued differential form|''k''-forms on ''M'' with values in '''V''']] so that | |||
<math>\Omega^0_M(\mathbf V)</math> is the space of sections of '''V''' and <math>\Omega^1_M(\mathbf V)</math> is the space of sections of | |||
Hom(T''M'','''V'''). For any section ''v'' of '''V''', the contraction of the covariant derivative ∇''v'' with a vector field ''X'' on ''M'' is denoted ∇<sub>''X''</sub>''v'' and satisfies the following Leibniz rule: | |||
:<math> \nabla_X(fv)=df(X)v+f \nabla_X v</math> | |||
for any smooth function ''f'' on ''M''. | |||
The covariant derivative can also be constructed from the Cartan connection ''η'' on ''P''. In fact, constructing it in this way is slightly more general in that ''V'' need not be a fully fledged representation of ''G''.<ref>See, for instance, {{Harvtxt|Čap|Gover|2002|loc=Definition 2.4}}.</ref> Suppose instead that that ''V'' is a (<math>\mathfrak g</math>, ''H'')-module: a representation of the group ''H'' with a compatible representation of the Lie algebra <math>\mathfrak{g}</math>. Recall that a section ''v'' of the induced vector bundle '''V''' over ''M'' can be thought of as an ''H''-equivariant map ''P'' → ''V''. This is the point of view we shall adopt. Let ''X'' be a vector field on ''M''. Choose any right-invariant lift <math>\bar{X}</math> to the tangent bundle of ''P''. Define | |||
:<math>\nabla_X v=dv(\bar{X})+\eta(\bar{X})\cdot v</math>. | |||
In order to show that ∇''v'' is well defined, it must: | |||
# be independent of the chosen lift <math>\bar{X}</math> | |||
# be equivariant, so that it descends to a section of the bundle '''V'''. | |||
For (1), the ambiguity in selecting a right-invariant lift of ''X'' is a transformation of the form <math>X\mapsto X+X_\xi</math> where <math>X_\xi</math> is the right-invariant vertical vector field induced from <math>\xi\in\mathfrak h</math>. So, calculating the covariant derivative in terms of the new lift <math>\bar{X}+X_\xi</math>, one has | |||
:<math>\nabla_X v=dv(\bar{X}+X_\xi)+\eta(\bar{X}+X_\xi))\cdot v</math> | |||
:<math>=dv(\bar{X}) +d v(X_\xi)+ \eta(\bar{X})\cdot v+ \xi\cdot v</math> | |||
:<math>=dv(\bar{X})+ \eta(\bar{X})\cdot v</math> | |||
since <math>\xi\cdot v+dv(X_\xi)=0</math> by taking the differential of the equivariance property <math>h\cdot R_{h}^*v=v</math> at ''h'' equal to the identity element. | |||
For (2), observe that since ''v'' is equivariant and <math>\bar{X}</math> is right-invariant, <math> dv(\bar{X})</math> is equivariant. On the other hand, since ''η'' is also equivariant, it follows that <math>\eta(\bar{X})\cdot v</math> is equivariant as well. | |||
===The fundamental or universal derivative=== | |||
Suppose that ''V'' is only a representation of the subgroup ''H'' and not necessarily the larger group ''G''. Let <math>\Omega^k(P,V)</math> be the space of ''V''-valued differential ''k''-forms on ''P''. In the presence of a Cartan connection, there is a canonical isomorphism | |||
:<math>\varphi\colon \Omega^k(P,V)\cong \Omega^0(P,V\otimes\bigwedge\nolimits^k\mathfrak g^*)</math> | |||
given by | |||
<math>\varphi(\beta)(\xi_1,\xi_2,\dots,\xi_k)=\beta(\eta^{-1}(\xi_1),\dots,\eta^{-1}(\xi_k))</math> where <math>\beta \in \Omega^k(P,V)</math> and <math>\xi_j \in \mathfrak g</math>. | |||
For each ''k'', the exterior derivative is a first order operator differential operator | |||
:<math>d\colon \Omega^k(P,V)\rightarrow \Omega^{k+1}(P,V)\,</math> | |||
and so, for ''k''=0, it defines a differential operator | |||
:<math> \varphi\circ d\colon \Omega^0(P,V)\rightarrow \Omega^0(P,V\otimes \mathfrak g^*).\,</math> | |||
Because ''η'' is equivariant, if ''v'' is equivariant, so is ''Dv'' := ''φ''(d''v''). It follows that this composite descends to a first order differential operator ''D'' from sections of '''V'''=''P''×<sub>''H''</sub>''V'' to sections of the bundle <math>P\times_H (\mathbf V\otimes \mathfrak g^*)</math>. This is called the fundamental or universal derivative, or fundamental D-operator. | |||
==Notes== | |||
{{Reflist|2}} | |||
== References == | |||
* {{citation | last1 = Čap|first1=Andreas |last2=Gover|first2=A. Rod | url=ftp://ftp.esi.ac.at/pub/Preprints/esi792.pdf|title=Tractor calculi for parabolic geometries] | journal = Trans. Amer. Math. Soc. | volume = 354 | year = 2002 | pages = 1511–1548 | doi = 10.1090/S0002-9947-01-02909-9 | issue = 04}}. | |||
* {{citation|first=A.|last=Čap|first2=K.|last2=Sagerschnig|year=2007|title=On Nurowski's Conformal Structure Associated to a Generic Rank Two Distribution in Dimension Five}}, ESI Preprint 1963. {{arxiv|0710.2208}}. | |||
* {{citation | first = Élie | last = Cartan |authorlink=Élie Cartan| title = Les systèmes de Pfaff à cinq variables et les équations aux dérivées partielles du second ordre| url = http://www.numdam.org/item?id=ASENS_1910_3_27__109_0| journal = Annales scientifiques de l'École Normale Supérieure| volume = 27 | year = 1910 | pages = 109–192}}. | |||
* {{citation | first = Élie | last = Cartan |authorlink=Élie Cartan| title = Sur les variétés à connexion affine et la théorie de la relativité généralisée (première partie)| url = http://www.numdam.org/item?id=ASENS_1923_3_40__325_0| journal = Annales Scientifiques de l'École Normale Supérieure| volume = 40 | year = 1923 | pages = 325–412}}. | |||
* {{citation | first = Élie | last = Cartan | authorlink=Élie Cartan|title = Sur les variétés à connexion projective|url = http://www.numdam.org/item?id=BSMF_1924__52__205_0| journal = Bulletin de la Société Mathématique | volume = 52 | year = 1924 | pages = 205–241}}. | |||
* {{citation | first = Élie | last = Cartan | authorlink=Élie Cartan|title = Espaces à connexion affine, projective et conforme | journal = Acta Math. | volume = 48 | year = 1926 | pages = 1–42 | doi = 10.1007/BF02629755}}. | |||
* {{citation | first = Élie | last = Cartan | authorlink=Élie Cartan|url= http://books.google.com/?id=-YvvVfQ7xz4C&pg=PP1|title = Geometry of Riemannian Spaces|edition= translation by James Glazebrook of ''Leçons sur la géométrie des espaces de Riemann'', 2nd|editor=with appendices by Robert Hermann|publisher = Math Sci Press, Massachusetts| publication-date = 1983|year=1951|isbn= 978-0-915692-34-7}}. | |||
* {{citation|last=Chevalley|first=C.|authorlink=Claude Chevalley|title=The Theory of Lie Groups|publisher=Princeton University Press|year=1946|isbn=0-691-08052-6}}. | |||
* {{citation | first = C. | last = Ehresmann | authorlink=Charles Ehresmann|title = Les connexions infinitésimales dans un espace fibré différentiel | journal = Colloque de Topologie, Bruxelles | year = 1950 | pages = 29–55 | mr = 0042768 }}. | |||
* {{citation|first=D.J.F.|last=Fox|title=Contact projective structures|journal=Indiana Univ. Math. J.|volume=54|issue=6|year=2005|pages=1547–1598|doi=10.1512/iumj.2005.54.2603}}. | |||
* {{citation | first = Phillip|last = Griffiths|authorlink=Phillip A. Griffiths|title = On Cartan's method of Lie groups and moving frames as applied to uniqueness and existence questions in differential geometry|journal = [[Duke Mathematical Journal]] |volume = 41|issue = 4 | year = 1974 | pages = 775–814 | doi = 10.1215/S0012-7094-74-04180-5}}. | |||
* {{citation | last1=Kobayashi|first1=Shoshichi|last2=Nomizu| first2=Katsumi | title = [[Foundations of Differential Geometry]], Vol. 1 & 2 | publisher=Wiley-Interscience | year=1996 |edition = New|isbn = 0-471-15733-3}}. | |||
* {{citation| last=Kobayashi|first=Shoshichi| title = Transformation Groups in Differential Geometry | publisher=Springer | year=1970|edition=1st |isbn = 3-540-05848-6}}. | |||
* {{citation | first = Shoshichi | last = Kobayashi | title = Theory of Connections | journal = Ann. Mat. Pura Appl. | year = 1957 | volume = 43 | pages = 119–194 | doi = 10.1007/BF02411907}}. | |||
* {{citation| last=Lumiste| first=Ü.| year=2001a| contribution=Conformal connection| contribution-url=http://eom.springer.de/c/c024730.htm| editor-last=Hazewinkel| editor-first=Michiel| editor-link=Michiel Hazewinkel | title=[[Encyclopaedia of Mathematics]]| publisher=Kluwer Academic Publishers| isbn=978-1-55608-010-4}}. | |||
* {{citation| last=Lumiste| first=Ü.| year=2001b| contribution=Connections on a manifold | contribution-url=http://eom.springer.de/c/c025180.htm| editor-last=Hazewinkel| editor-first=Michiel| editor-link=Michiel Hazewinkel | title=[[Encyclopaedia of Mathematics]]| publisher=Kluwer Academic Publishers| isbn=978-1-55608-010-4}}. | |||
*{{citation|first=K.|last=Sagerschnig|title=Split octonions and generic rank two distributions in dimension five|url=http://www.emis.de/journals/AM/06-S/sager.ps.gz|journal=Arch. Math. (Brno)|volume=42 Suppl.|pages=329–339|year=2006}}. | |||
* {{citation | first = R.W. | last = Sharpe | title = Differential Geometry: Cartan's Generalization of Klein's Erlangen Program | publisher = Springer-Verlag, New York | year = 1997 | isbn = 0-387-94732-9}}. | |||
* {{citation|last=Slovák|first=Jan|url=ftp://www.math.muni.cz/pub/math/people/Slovak/papers/drsc.ps|title=Parabolic Geometries|series=Research Lecture Notes|publisher=Part of DrSc-dissertation, Masaryk University|year= 1997}}. | |||
==Books== | |||
* {{citation | last1=Kobayashi|first1= Shoshichi| title = Transformations Groups in Differential Geometry| publisher= Springer-Verlag, Berlin | year=1972|edition=Classics in Mathematics 1995 | isbn=978-3-540-58659-3}}. | |||
:: The section '''3. Cartan Connections''' [pages 127-130] treats conformal and projective connections in a unified manner. | |||
==External links== | |||
*{{springer|id=a/a010950|title=Affine connection|author=Ü. Lumiste}} | |||
[[Category:Differential geometry]] | |||
[[Category:Connection (mathematics)]] |
Latest revision as of 07:23, 2 September 2013
In the mathematical field of differential geometry, a Cartan connection is a flexible generalization of the notion of an affine connection. It may also be regarded as a specialization of the general concept of a principal connection, in which the geometry of the principal bundle is tied to the geometry of the base manifold using a solder form. Cartan connections describe the geometry of manifolds modelled on homogeneous spaces.
The theory of Cartan connections was developed by Élie Cartan, as part of (and a way of formulating) his method of moving frames (repère mobile).[1] The main idea is to develop a suitable notion of the connection forms and curvature using moving frames adapted to the particular geometrical problem at hand. For instance, in relativity or Riemannian geometry, orthonormal frames are used to obtain a description of the Levi-Civita connection as a Cartan connection. For Lie groups, Maurer–Cartan frames are used to view the Maurer–Cartan form of the group as a Cartan connection.
Cartan reformulated the differential geometry of (pseudo) Riemannian geometry, as well as the differential geometry of manifolds equipped with some non-metric structure, including Lie groups and homogeneous spaces. The term Cartan connection most often refers to Cartan's formulation of a (pseudo-)Riemannian, affine, projective, or conformal connection. Although these are the most commonly used Cartan connections, they are special cases of a more general concept.
Cartan's approach seems at first to be coordinate dependent because of the choice of frames it involves. However, it is not, and the notion can be described precisely using the language of principal bundles. Cartan connections induce covariant derivatives and other differential operators on certain associated bundles, hence a notion of parallel transport. They have many applications in geometry and physics: see the method of moving frames, Cartan connection applications and Einstein–Cartan theory for some examples.
Introduction
At its roots, geometry consists of a notion of congruence between different objects in a space. In the late 19th century, notions of congruence were typically supplied by the action of a Lie group on space. Lie groups generally act quite rigidly, and so a Cartan geometry is a generalization of this notion of congruence to allow for curvature to be present. The flat Cartan geometries — those with zero curvature — are locally equivalent to homogeneous spaces, hence geometries in the sense of Klein.
A Klein geometry consists of a Lie group G together with a Lie subgroup H of G. Together G and H determine a homogeneous space G/H, on which the group G acts by left-translation. Klein's aim was then to study objects living on the homogeneous space which were congruent by the action of G. A Cartan geometry extends the notion of a Klein geometry by attaching to each point of a manifold a copy of a Klein geometry, and to regard this copy as tangent to the manifold. Thus the geometry of the manifold is infinitesimally identical to that of the Klein geometry, but globally can be quite different. In particular, Cartan geometries no longer have a well-defined action of G on them. However, a Cartan connection supplies a way of connecting the infinitesimal model spaces within the manifold by means of parallel transport.
Motivation
Consider a smooth surface S in 3-dimensional Euclidean space R3. Near to any point, S can be approximated by its tangent plane at that point, which is an affine subspace of Euclidean space. The affine subspaces are model surfaces — they are the simplest surfaces in R3, and are homogeneous under the Euclidean group of the plane, hence they are Klein geometries in the sense of Felix Klein's Erlangen programme. Every smooth surface S has a unique affine plane tangent to it at each point. The family of all such planes in R3, one attached to each point of S, is called the congruence of tangent planes. A tangent plane can be "rolled" along S, and as it does so the point of contact traces out a curve on S. Conversely, given a curve on S, the tangent plane can be rolled along that curve. This provides a way to identify the tangent planes at different points along the curve by affine (in fact Euclidean) transformations, and is an example of a Cartan connection called an affine connection.
Another example is obtained by replacing the planes, as model surfaces, by spheres, which are homogeneous under the Möbius group of conformal transformations. There is no longer a unique sphere tangent to a smooth surface S at each point, since the radius of the sphere is undetermined. This can be fixed by supposing that the sphere has the same mean curvature as S at the point of contact. Such spheres can again be rolled along curves on S, and this equips S with another type of Cartan connection called a conformal connection.
Differential geometers in the late 19th and early 20th century were very interested in using model families such as planes or spheres to describe the geometry of surfaces. A family of model spaces attached to each point of a surface S is called a congruence: in the previous examples there is a canonical choice of such a congruence. A Cartan connection provides an identification between the model spaces in the congruence along any curve in S. An important feature of these identifications is that the point of contact of the model space with S always moves with the curve. This generic condition is characteristic of Cartan connections.
In the modern treatment of affine connections, the point of contact is viewed as the origin in the tangent plane (which is then a vector space), and the movement of the origin is corrected by a translation, and so Cartan connections are not needed. However, there is no canonical way to do this in general: in particular for the conformal connection of a sphere congruence, it is not possible to separate the motion of the point of contact from the rest of the motion in a natural way.
In both of these examples the model space is a homogeneous space G/H.
- In the first case, G/H is the affine plane, with G = Aff(R2) the affine group of the plane, and H = GL(2) the corresponding general linear group.
- In the second case, G/H is the conformal (or celestial) sphere, with G = O+(3,1) the (orthochronous) Lorentz group, and H the stabilizer of a null line in R3,1.
The Cartan geometry of S consists of a copy of the model space G/H at each point of S (with a marked point of contact) together with a notion of "parallel transport" along curves which identifies these copies using elements of G. This notion of parallel transport is generic in the intuitive sense that the point of contact always moves along the curve.
In general, let G be a group with a subgroup H, and M a manifold of the same dimension as G/H. Then, roughly speaking, a Cartan connection on M is a G-connection which is generic with respect to a reduction to H.
Affine connections
Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. An affine connection on a manifold M is a connection (principal bundle) on the frame bundle of M (or equivalently, a connection (vector bundle) on the tangent bundle of M). A key aspect of the Cartan connection point of view is to elaborate this notion in the context of principal bundles (which could be called the "general or abstract theory of frames").
Let H be a Lie group. Then a principal H-bundle is a fiber bundle P over M with a smooth action of H on P which is free and transitive on the fibers. Thus P is a smooth manifold with a smooth map π: P → M which looks locally like the trivial bundle M × H → M. The frame bundle of M is a principal GL(n)-bundle, while if M is a Riemannian manifold, then the orthonormal frame bundle is a principal O(n)-bundle.
Let Rh denote the (right) action of h ∈ H on P. The derivative of this action defines a vertical vector field on P for each element ξ of : if h(t) is a 1-parameter subgroup with h(0)=e (the identity element) and h '(0)=ξ, then the corresponding vertical vector field is
A principal H-connection on P is a 1-form on P, with values in the Lie algebra of H, such that
The intuitive idea is that ω(X) provides a vertical component of X, using the isomorphism of the fibers of π with H to identify vertical vectors with elements of .
Frame bundles have additional structure called the solder form, which can be used to extend a principal connection on P to a trivialization of the tangent bundle of P called an absolute parallelism.
In general, suppose that M has dimension n and H acts on Rn (this could be any n-dimensional real vector space). A solder form on a principal H-bundle P over M is an Rn-valued 1-form θ: TP → Rn which is horizontal and equivariant so that it induces a bundle homomorphism from TM to the associated bundle P ×H Rn. This is furthermore required to be a bundle isomorphism. Frame bundles have a (canonical or tautological) solder form which sends a tangent vector X ∈ TpP to the coordinates of dπp(X) ∈ Tπ(p)M with respect to the frame p.
The pair (ω, θ) (a principal connection and a solder form) defines a 1-form η on P, with values in the Lie algebra of the semidirect product G of H with Rn, which provides an isomorphism of each tangent space TpP with . It induces a principal connection α on the associated principal G-bundle P ×H G. This is a Cartan connection.
Cartan connections generalize affine connections in two ways.
- The action of H on Rn need not be effective. This allows, for example, the theory to include spin connections, in which H is the spin group Spin(n) rather than the orthogonal group O(n).
- The group G need not be a semidirect product of H with Rn.
Klein geometries as model spaces
Klein's Erlangen programme suggested that geometry could be regarded as a study of homogeneous spaces: in particular, it is the study of the many geometries of interest to geometers of 19th century (and earlier). A Klein geometry consisted of a space, along with a law for motion within the space (analogous to the Euclidean transformations of classical Euclidean geometry) expressed as a Lie group of transformations. These generalized spaces turn out to be homogeneous smooth manifolds diffeomorphic to the quotient space of a Lie group by a Lie subgroup. The extra differential structure that these homogeneous spaces possess allows one to study and generalize their geometry using calculus.
The general approach of Cartan is to begin with such a smooth Klein geometry, given by a Lie group G and a Lie subgroup H, with associated Lie algebras and , respectively. Let P be the underlying principal homogeneous space of G. A Klein geometry is the homogeneous space given by the quotient P/H of P by the right action of H. There is a right H-action on the fibres of the canonical projection
- π: P → P/H
given by Rhg = gh. Moreover, each fibre of π is a copy of H. P has the structure of a principal H-bundle over P/H.[2]
A vector field X on P is vertical if dπ(X) = 0. Any ξ ∈ gives rise to a canonical vertical vector field Xξ by taking the derivative of the right action of the 1-parameter subgroup of H associated to ξ. The Maurer-Cartan form η of P is the -valued one-form on P which identifies each tangent space with the Lie algebra. It has the following properties:
- Ad(h) Rh*η = η for all h in H
- η(Xξ) = ξ for all ξ in
- for all g∈P, η restricts a linear isomorphism of TgP with (η is an absolute parallelism on P).
In addition to these properties, η satisfies the structure (or structural) equation
Conversely, one can show that given a manifold M and a principal H-bundle P over M, and a 1-form η with these properties, then P is locally isomorphic as an H-bundle to the principal homogeneous bundle G→G/H. The structure equation is the integrability condition for the existence of such a local isomorphism.
A Cartan geometry is a generalization of a smooth Klein geometry, in which the structure equation is not assumed, but is instead used to define a notion of curvature. Thus the Klein geometries are said to be the flat models for Cartan geometries.[3]
Cartan connections and pseudogroups
Cartan connections are closely related to pseudogroup structures on a manifold. Each is thought of as modelled on a Klein geometry G/H, in a manner similar to the way in which Riemannian geometry is modelled on Euclidean space. On a manifold M, one imagines attaching to each point of M a copy of the model space G/H. The symmetry of the model space is then built into the Cartan geometry or pseudogroup structure by positing that the model spaces of nearby points are related by a transformation in G. The fundamental difference between a Cartan geometry and pseudogroup geometry is that the symmetry for a Cartan geometry relates infinitesimally close points by an infinitesimal transformation in G (i.e., an element of the Lie algebra of G) and the analogous notion of symmetry for a pseudogroup structure applies for points that are physically separated within the manifold.
The process of attaching spaces to points, and the attendant symmetries, can be concretely realized by using special coordinate systems.[4] To each point p ∈ M, a neighborhood Up of p is given along with a mapping φp : Up → G/H. In this way, the model space is attached to each point of M by realizing M locally at each point as an open subset of G/H. We think of this as a family of coordinate systems on M, parametrized by the points of M. Two such parametrized coordinate systems φ and φ′ are H-related if there is an element hp ∈ H, parametrized by p, such that
- φ′p = hp φp.[5]
This freedom corresponds roughly to the physicists' notion of a gauge.
Nearby points are related by joining them with a curve. Suppose that p and p′ are two points in M joined by a curve pt. Then pt supplies a notion of transport of the model space along the curve.[6] Let τt : G/H → G/H be the (locally defined) composite map
- τt = φpt o φp0-1.
Intuitively, τt is the transport map. A pseudogroup structure requires that τt be a symmetry of the model space for each t: τt ∈ G. A Cartan connection requires only that the derivative of τt be a symmetry of the model space: τ′0 ∈ g, the Lie algebra of G.
Typical of Cartan, one motivation for introducing the notion of a Cartan connection was to study the properties of pseudogroups from an infinitesimal point of view. A Cartan connection defines a pseudogroup precisely when the derivative of the transport map τ′ can be integrated, thus recovering a true (G-valued) transport map between the coordinate systems. There is thus an integrability condition at work, and Cartan's method for realizing integrability conditions was to introduce a differential form.
In this case, τ′0 defines a differential form at the point p as follows. For a curve γ(t) = pt in M starting at p, we can associate the tangent vector X, as well as a transport map τtγ. Taking the derivative determines a linear map
So θ defines a g-valued differential 1-form on M.
This form, however, is dependent on the choice of parametrized coordinate system. If h : U → H is an H-relation between two parametrized coordinate systems φ and φ′, then the corresponding values of θ are also related by
where ωH is the Maurer-Cartan form of H.
Formal definition
A Cartan geometry modelled on a homogeneous space G/H can be viewed as a deformation of this geometry which allows for the presence of curvature. For example:
- a Riemannian manifold can be seen as a deformation of Euclidean space;
- a Lorentzian manifold can be seen as a deformation of Minkowski space;
- a conformal manifold can be seen as a deformation of the conformal sphere;
- a manifold equipped with an affine connection can be seen as a deformation of an affine space.
There are two main approaches to the definition. In both approaches, M is a smooth manifold of dimension n, H is a Lie group of dimension m, with Lie algebra , and G is a Lie group G of dimension n+m, with Lie algebra , containing H as a subgroup.
Definition via gauge transitions
A Cartan connection consists[7][8] of a coordinate atlas of open sets U in M, along with a g-valued 1-form θU defined on each chart such that
- θU : TU → g.
- θU mod h : TuU → g/h is a linear isomorphism for every u ∈ U.
- For any pair of charts U and V in the atlas, there is a smooth mapping h : U ∩ V → H such that
- where ωH is the Maurer-Cartan form of H.
By analogy with the case when the θU came from coordinate systems, condition 3 means that φU is related to φV by h.
The curvature of a Cartan connection consists of a system of 2-forms defined on the charts, given by
ΩU satisfy the compatibility condition:
- If the forms θU and θV are related by a function h : U ∩ V → H, as above, then ΩV = Ad(h-1) ΩU
The definition can be made independent of the coordinate systems by forming the quotient space
of the disjoint union over all U in the atlas. The equivalence relation ~ is defined on pairs (x,h1) ∈ U1 × H and (x, h2) ∈ U2 × H, by
- (x,h1) ~ (x, h2) if and only if x ∈ U1 ∩ U2, θU1 is related to θU2 by h, and h2 = h(x)-1 h1.
Then P is a principal H-bundle on M, and the compatibility condition on the connection forms θU implies that they lift to a g-valued 1-form η defined on P (see below).
Definition via absolute parallelism
Let P be a principal H bundle over M. Then a Cartan connection[9] is a -valued 1-form η on P such that
- for all h in H, Ad(h)Rh*η = η
- for all ξ in , η(Xξ) = ξ
- for all p in P, the restriction of η defines a linear isomorphism from the tangent space TpP to .
The last condition is sometimes called the Cartan condition: it means that η defines an absolute parallelism on P. The second condition implies that η is already injective on vertical vectors and that the 1-form η mod , with values in , is horizontal. The vector space is a representation of H using the adjoint representation of H on , and the first condition implies that η mod is equivariant. Hence it defines a bundle homomorphism from TM to the associated bundle . The Cartan condition is equivalent to this bundle homomorphism being an isomorphism, so that η mod is a solder form.
The curvature of a Cartan connection is the -valued 2-form Ω defined by
Note that this definition of a Cartan connection looks very similar to that of a principal connection. There are several important differences, however. First, the 1-form η takes values in g, but is only equivariant under the action of H. Indeed, it cannot be equivariant under the full group G because there is no G bundle and no G action. Secondly, the 1-form is an absolute parallelism, which intuitively means that η yields information about the behavior of additional directions in the principal bundle (rather than simply being a projection operator onto the vertical space). Concretely, the existence of a solder form binds (or solders) the Cartan connection to the underlying differential topology of the manifold.
An intuitive interpretation of the Cartan connection in this form is that it determines a fracturing of the tautological principal bundle associated to a Klein geometry. Thus Cartan geometries are deformed analogues of Klein geometries. This deformation is roughly a prescription for attaching a copy of the model space G/H to each point of M and thinking of that model space as being tangent to (and infinitesimally identical with) the manifold at a point of contact. The fibre of the tautological bundle G → G/H of the Klein geometry at the point of contact is then identified with the fibre of the bundle P. Each such fibre (in G) carries a Maurer-Cartan form for G, and the Cartan connection is a way of assembling these Maurer-Cartan forms gathered from the points of contact into a coherent 1-form η defined on the whole bundle. The fact that only elements of H contribute to the Maurer-Cartan equation Ad(h)Rh*η = η has the intuitive interpretation that any other elements of G would move the model space away from the point of contact, and so no longer be tangent to the manifold.
From the Cartan connection, defined in these terms, one can recover a Cartan connection as a system of 1-forms on the manifold (as in the gauge definition) by taking a collection of local trivializations of P given as sections sU : U → P and letting θU = s*η be the pullbacks of the Cartan connection along the sections.
Cartan connections as principal connections
Another way in which to define a Cartan connection is as a principal connection on a certain principal G-bundle. From this perspective, a Cartan connection consists of
- a principal G-bundle Q over M
- a principal G-connection α on Q (the Cartan connection)
- a principal H-subbundle P of Q (i.e., a reduction of structure group)
such that the pullback η of α to P satisfies the Cartan condition.
The principal connection α on Q can be recovered from the form η by taking Q to be the associated bundle P ×H G. Conversely, the form η can be recovered from α by pulling back along the inclusion P ⊂ Q.
Since α is a principal connection, it induces a connection on any associated bundle to Q. In particular, the bundle Q ×G G/H of homogeneous spaces over M, whose fibers are copies of the model space G/H, has a connection. The reduction of structure group to H is equivalently given by a section s of E = Q ×G G/H. The fiber of over x in M may be viewed as the tangent space at s(x) to the fiber of Q ×G G/H over x. Hence the Cartan condition has the intuitive interpretation that the model spaces are tangent to M along the section s. Since this identification of tangent spaces is induced by the connection, the marked points given by s always move under parallel transport.
Definition by an Ehresmann connection
Yet another way to define a Cartan connection is with an Ehresmann connection on the bundle E = Q ×G G/H of the preceding section.[10] A Cartan connection then consists of
- A fibre bundle π : E → M with fibre G/H and vertical space VE ⊂ TE.
- A section s : M → E.
- A G-connection θ : TE → VE such that
- s*θx : TxM → Vs(x)E is a linear isomorphism of vector spaces for all x ∈ M.
This definition makes rigorous the intuitive ideas presented in the introduction. First, the preferred section s can be thought of as identifying a point of contact between the manifold and the tangent space. The last condition, in particular, means that the tangent space of M at x is isomorphic to the tangent space of the model space at the point of contact. So the model spaces are, in this way, tangent to the manifold.
This definition also brings prominently into focus the idea of development. If xt is a curve in M, then the Ehresmann connection on E supplies an associated parallel transport map τt : Ext → Ex0 from the fibre over the endpoint of the curve to the fibre over the initial point. In particular, since E is equipped with a preferred section s, the points s(xt) transport back to the fibre over x0 and trace out a curve in Ex0. This curve is then called the development of the curve xt.
To show that this definition is equivalent to the others above, one must introduce a suitable notion of a moving frame for the bundle E. In general, this is possible for any G-connection on a fibre bundle with structure group G. See Ehresmann connection#Associated bundles for more details.
Special Cartan connections
Reductive Cartan connections
Let P be a principal H-bundle on M, equipped with a Cartan connection η : TP → g. If g is a reductive module for H, meaning that g admits an Ad(H)-invariant splitting of vector spaces g=h⊕m, then the m-component of η generalizes the solder form for an affine connection.[11] In detail, η splits into h and m components:
- η = ηh + ηm.
Note that the 1-form ηh is a principal H-connection on the original Cartan bundle P. Moreover, the 1-form ηm satisfies:
- ηm(X) = 0 for every vertical vector X ∈ TP. (ηm is horizontal.)
- Rh*ηm = Ad(h-1)ηm for every h ∈ H. (ηm is equivariant under the right H-action.)
In other words, η is a solder form for the bundle P.
Hence, P equipped with the form ηm defines a (first order) H-structure on M. The form ηh defines a connection on the H-structure.
Parabolic Cartan connections
If g is a semisimple Lie algebra with parabolic subalgebra p (i.e., p contains a maximal solvable subalgebra of g) and G and P are associated Lie groups, then a Cartan connection modelled on (G,P,g,p) is called a parabolic Cartan geometry, or simply a parabolic geometry. A distinguishing feature of parabolic geometries is a Lie algebra structure on its cotangent spaces: this arises because the perpendicular subspace p⊥ of p in g with respect to the Killing form of g is a subalgebra of p, and the Killing form induces a natural duality between p⊥ and g/p. Thus the bundle associated to p⊥ is isomorphic to the cotangent bundle.
Parabolic geometries include many of those of interest in research and applications of Cartan connections, such as the following examples:
- Conformal connections: Here G = SO(p+1,q+1), and P is the stabilizer of a null ray in Rn+2.
- Projective connections: Here G = PGL(n+1) and P is the stabilizer of a point in RPn.
- CR structures and Cartan-Chern-Tanaka connections: G = PSU(p+1,q+1), P = stabilizer of a point on the projective null hyperquadric.
- Contact projective connections:[12] Here G = SP(2n+2) and P is the stabilizer of the ray generated by the first standard basis vector in Rn+2.
- Generic rank 2 distributions on 5-manifolds: Here G = Aut(Os) is the automorphism group of the algebra Os of split octonions, a closed subgroup of SO(3,4), and P is the intersection of G with the stabilizer of the isotropic line spanned by the first standard basis vector in R7 viewed as the purely imaginary split octonions (orthogonal complement of the unit element in Os).[13]
Associated differential operators
Covariant differentiation
Suppose that M is a Cartan geometry modelled on G/H, and let (Q,α) be the principal G-bundle with connection, and (P,η) the corresponding reduction to H with η equal to the pullback of α. Let V a representation of G, and form the vector bundle V = Q ×G V over M. Then the principal G-connection α on Q induces a covariant derivative on V, which is a first order linear differential operator
where denotes the space of k-forms on M with values in V so that is the space of sections of V and is the space of sections of Hom(TM,V). For any section v of V, the contraction of the covariant derivative ∇v with a vector field X on M is denoted ∇Xv and satisfies the following Leibniz rule:
for any smooth function f on M.
The covariant derivative can also be constructed from the Cartan connection η on P. In fact, constructing it in this way is slightly more general in that V need not be a fully fledged representation of G.[14] Suppose instead that that V is a (, H)-module: a representation of the group H with a compatible representation of the Lie algebra . Recall that a section v of the induced vector bundle V over M can be thought of as an H-equivariant map P → V. This is the point of view we shall adopt. Let X be a vector field on M. Choose any right-invariant lift to the tangent bundle of P. Define
In order to show that ∇v is well defined, it must:
For (1), the ambiguity in selecting a right-invariant lift of X is a transformation of the form where is the right-invariant vertical vector field induced from . So, calculating the covariant derivative in terms of the new lift , one has
since by taking the differential of the equivariance property at h equal to the identity element.
For (2), observe that since v is equivariant and is right-invariant, is equivariant. On the other hand, since η is also equivariant, it follows that is equivariant as well.
The fundamental or universal derivative
Suppose that V is only a representation of the subgroup H and not necessarily the larger group G. Let be the space of V-valued differential k-forms on P. In the presence of a Cartan connection, there is a canonical isomorphism
For each k, the exterior derivative is a first order operator differential operator
and so, for k=0, it defines a differential operator
Because η is equivariant, if v is equivariant, so is Dv := φ(dv). It follows that this composite descends to a first order differential operator D from sections of V=P×HV to sections of the bundle . This is called the fundamental or universal derivative, or fundamental D-operator.
Notes
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References
- Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010, ESI Preprint 1963. Template:Arxiv. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010. - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010.
Books
- Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010.
- The section 3. Cartan Connections [pages 127-130] treats conformal and projective connections in a unified manner.
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- ↑ Although Cartan only began formalizing this theory in particular cases in the 1920s Template:Harv, he made much use of the general idea much earlier. In particular, the high point of his remarkable 1910 paper on Pfaffian systems in five variables is the construction of a Cartan connection modelled on a 5-dimensional homogeneous space for the exceptional Lie group G2, which he and Engels had discovered independently in 1894.
- ↑ Template:Harvnb.
- ↑ See R. Hermann (1983), Appendix 1–3 to Template:Harvtxt.
- ↑ This appears to be Cartan's way of viewing the connection. Cf. Template:Harvnb; Template:Harvnb especially ..un repère définissant un système de coordonnées projectives...; Template:Harvnb. Modern readers can arrive at various interpretations of these statements, cf. Hermann's 1983 notes in Template:Harvnb.
- ↑ More precisely, hp is required to be in the isotropy group of φp(p), which is a group in G isomorphic to H.
- ↑ In general, this is not the rolling map described in the motivation, although it is related.
- ↑ Template:Harvnb.
- ↑ Template:Harvnb.
- ↑ This is the standard definition. Cf. Hermann (1983), Appendix 2 to Template:Harvnb; Template:Harvnb; Template:Harvnb; Template:Harvnb.
- ↑ Template:Harvnb, Template:Harvnb, Template:Harvnb.
- ↑ For a treatment of affine connections from this point of view, see Template:Harvtxt.
- ↑ See, for example, Template:Harvtxt.
- ↑ Template:Harvnb; Template:Harvnb.
- ↑ See, for instance, Template:Harvtxt.