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{{Distinguish|Cauchy's integral theorem}}


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In [[mathematics]], '''Cauchy's integral formula''', named after [[Augustin-Louis Cauchy]], is a central statement in [[complex analysis]]. It expresses the fact that a [[holomorphic function]] defined on a disk is completely determined by its values on the boundary of the disk, and it provides integral formulas for all derivatives of a holomorphic function. Cauchy's formula shows that, in complex analysis, "differentiation is equivalent to integration": complex differentiation, like integration, behaves well under [[uniform convergence|uniform limits]] – a result denied in [[real analysis]].
 
==Theorem==
Suppose ''U'' is an [[open subset]] of the [[complex plane]] '''C''', ''f'' : ''U'' → '''C''' is a holomorphic function and the closed disk
''D'' = { ''z'' : | ''z'' &minus; ''z''<sub>0</sub>| ≤ ''r''} is completely contained in ''U''. Let <math>\gamma</math> be the circle forming the [[boundary (topology)|boundary]] of ''D''. Then for every ''a'' in the [[interior (topology)|interior]] of ''D'':
 
:<math>f(a) = \frac{1}{2\pi i} \oint_\gamma \frac{f(z)}{z-a}\, dz </math>
 
where the [[contour integral]] is taken [[Curve orientation|counter-clockwise]].
 
The proof of this statement uses the [[Cauchy integral theorem]] and similarly only requires ''f'' to be [[complex differentiable]]. Since the reciprocal of the denominator of the integrand in Cauchy's integral formula can be expanded as a [[power series]] in the variable (''a''&nbsp;&minus;&nbsp;''z''<sub>0</sub>), it follows that [[holomorphic functions are analytic]]. In particular ''f'' is actually infinitely differentiable, with
 
:<math>f^{(n)}(a) = \frac{n!}{2\pi i} \oint_\gamma \frac{f(z)}{(z-a)^{n+1}}\, dz.</math>
This formula is sometimes referred to as '''Cauchy's differentiation formula'''.
 
The circle ''&gamma;'' can be replaced by any closed [[rectifiable curve]] in ''U'' which has [[winding number]] one about ''a''. Moreover, as for the Cauchy integral theorem, it is sufficient to require that ''f'' be holomorphic in the open region enclosed by the path and continuous on its [[closure (topology)|closure]].
 
== Proof sketch ==
 
By using the Cauchy integral theorem, one can show that the integral over ''C'' (or the closed rectifiable curve) is equal to the same integral taken over an arbitrarily small circle around ''a''. Since ''f''(''z'') is continuous, we can choose a circle small enough on which ''f''(''z'') is arbitrarily close to ''f''(''a''). On the other hand, the integral
 
:<math>\oint_C  \frac{1}{z-a} \,dz = 2 \pi i,</math>
 
over any circle ''C'' centered at ''a''. This can be calculated directly via a parametrization ([[integration by substitution]]) <math> z(t) = a + \varepsilon e^{it} </math> where 0 ≤ ''t'' ≤ 2''π'' and ''ε'' is the radius of the circle.
 
Letting ''ε'' → 0 gives the desired estimate
 
: <math>\begin{align}
\left | \frac{1}{2 \pi i} \oint_C \frac{f(z)}{z-a} \,dz  - f(a) \right |
&= \left | \frac{1}{2 \pi i} \oint_C \frac{f(z)-f(a)}{z-a} \,dz \right |\\[.5em]
&= \left | \frac{1}{2\pi i}\int_0^{2\pi}\left(\frac{f(z(t))-f(a)}{\varepsilon\cdot e^{i\cdot t}}\cdot\varepsilon\cdot e^{t\cdot i}i\right )\,dt\right |\\
&\leq \frac{1}{2 \pi} \int_0^{2\pi} \frac{ |f(z(t)) - f(a)| } {\varepsilon} \,\varepsilon\,dt\\[.5em]
&\leq \max_{|z-a|=\varepsilon}|f(z) - f(a)|
\xrightarrow[\varepsilon\to 0]{} 0.
\end{align}</math>
 
== Example ==
[[File:ComplexResiduesExample.png|thumb|300px|Surface of the real part of the function ''g''(''z'') = ''z''<sup>2</sup>&nbsp;/&nbsp;(''z''<sup>2</sup> + 2''z'' + 2) and its singularities, with the contours described in the text.]]
Consider the function
 
:<math>g(z)=\frac{z^2}{z^2+2z+2}</math>
 
and the contour described by |''z''| = 2, call it ''C''.
 
To find the integral of ''g''(''z'') around the contour, we need to know the singularities of ''g''(''z''). Observe that we can rewrite ''g'' as follows:
:<math>g(z)=\frac{z^2}{(z-z_1)(z-z_2)}</math>
where  <math>z_1=-1+i,</math> <math>z_2=-1-i.</math>
 
Clearly the poles become evident, their [[absolute value|moduli]] are less than 2 and thus lie inside the contour and are subject to consideration by the formula. By the [[Cauchy-Goursat theorem]], we can express the integral around the contour as the sum of the integral around ''z''<sub>1</sub> and ''z''<sub>2</sub> where the contour is a small circle around each pole<!-- diagram works best -->. Call these contours ''C''<sub>1</sub> around ''z''<sub>1</sub> and ''C''<sub>2</sub> around ''z''<sub>2</sub>.
 
Now, around ''C''<sub>1</sub>, ''f'' is [[holomorphic function|analytic]] (since the contour does not contain the other singularity), and this allows us to write ''f'' in the form we require, namely:
 
:<math>f(z)=\frac{z^2}{z-z_2}</math>
 
and now
 
:<math>\oint_C \frac{f(z)}{z-a}\, dz=2\pi i\cdot f(a)</math>
 
<!-- blank line -->
 
:<math>
  \oint_{C_1} \frac{\left(\frac{z^2}{z-z_2}\right)}{z-z_1}\,dz
=2\pi i\frac{z_1^2}{z_1-z_2}.
</math>
 
Doing likewise for the other contour:
 
:<math>f(z)=\frac{z^2}{z-z_1},</math>
 
<!-- extra blank line so that adjacent lines of "displayed" TeX won't look too cluttered -->
 
:<math>
  \oint_{C_2} \frac{\left(\frac{z^2}{z-z_1}\right)}{z-z_2}\,dz
=2\pi i\frac{z_2^2}{z_2-z_1}.
</math>
 
The integral around the original contour ''C'' then is the sum of these two integrals:
 
:<math>\begin{align}
    \oint_C \frac{z^2}{z^2+2z+2}\,dz
&{}= \oint_{C_1} \frac{\left(\frac{z^2}{z-z_2}\right)}{z-z_1}\,dz
  + \oint_{C_2} \frac{\left(\frac{z^2}{z-z_1}\right)}{z-z_2}\,dz \\[.5em]
&{}= 2\pi i\left(\frac{z_1^2}{z_1-z_2}+\frac{z_2^2}{z_2-z_1}\right) \\[.5em]
&{}= 2\pi i(-2) \\[.3em]
&{}=-4\pi i.
\end{align}</math>
<br />
An elementary trick using [[partial fraction decomposition]]:
:<math>
  \oint_C g(z)dz
=\oint_C \left(1-\frac{1}{z-z_1}-\frac{1}{z-z_2}\right)dz
=0-2\pi i-2\pi i
=-4\pi i
</math>
 
==Consequences==
The integral formula has broad applications. First, it implies that a function which is holomorphic in an open set is in fact [[infinitely differentiable]] there.  Furthermore, it is an [[analytic function]], meaning that it can be represented as a [[power series]].  The proof of this uses the [[dominated convergence theorem]] and the [[geometric series]] applied to
 
:<math>f(\zeta) = \frac{1}{2\pi i}\int_C \frac{f(z)}{z-\zeta}\,dz.</math>
 
The formula is also used to prove the [[residue theorem]], which is a result for [[meromorphic function]]s, and a related result, the [[argument principle]]. It is known from [[Morera's theorem]] that the uniform limit of holomorphic functions is holomorphic. This can also be deduced from Cauchy's integral formula: indeed the formula also holds in the limit and the integrand, and hence the integral, can be expanded as a power series. In addition the Cauchy formulas for the higher order derivatives show that all these derivatives also converge uniformly.
 
The analog of the Cauchy integral formula in real analysis is the [[Poisson integral formula]] for [[harmonic function]]s; many of the results for holomorphic functions carry over to this setting. No such results, however, are valid for more general classes of differentiable or real analytic functions. For instance, the existence of the first derivative of a real function need not imply the existence of higher order derivatives, nor in particular the analyticity of the function.  Likewise, the uniform limit of a sequence of (real) differentiable functions may fail to be differentiable, or may be differentiable but with a derivative  which is not the limit of the derivatives of the members of the sequence.
 
Another consequence is that if {{math|1=''f''(''z'') = ∑ ''a''<sub>''n''</sub> ''z''<sup>''n''</sup> }} is holomorphic in |''z''| < ''R'' and 0 < ''r'' < ''R'' then the coefficients {{math|''a''<sub>''n''</sub>}} satisfy '''Cauchy's inequality'''<ref>{{harvnb|Titchmarsh|1939|p=84}}</ref>
 
:<math>\displaystyle{|a_n|\le r^{-n} \sup_{|z|=r}|f(z)|.}</math>
 
==Generalizations==
 
===Smooth functions===
A version of Cauchy's integral formula is the Cauchy-[[Dimitrie Pompeiu|Pompeiu]] formula,<ref>[http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:36.0454.04] [http://archive.numdam.org/ARCHIVE/AFST/AFST_1905_2_7_3/AFST_1905_2_7_3_265_0/AFST_1905_2_7_3_265_0.pdf] D. Pompeiu, ''Sur la continuité des fonctions de variables complexes'', Annales de la faculté des sciences de Toulouse Sér. 2, 7 no. 3 (1905), p.&nbsp;265&ndash;315</ref> and holds for [[smooth function]]s as well, as it is based on [[Stokes' theorem]].  Let ''D'' be a disc in '''C''' and suppose that ''f'' is a complex-valued [[continuously differentiable function|''C''<sup>1</sup>]] function on the [[closure (topology)|closure]] of ''D''.  Then {{harv|Hörmander|1966|loc=Theorem 1.2.1}}
 
:<math>f(\zeta) = \frac{1}{2\pi i}\int_{\partial D} \frac{f(z) dz}{z-\zeta} + \frac{1}{2\pi i}\iint_D \frac{\partial f}{\partial \bar{z}}(z) \frac{dz\wedge d\bar{z}}{z-\zeta}.</math>
 
One may use this representation formula to solve the inhomogeneous [[Cauchy&ndash;Riemann equations]] in ''D''.  Indeed, if ''φ'' is a function in ''D'', then a particular solution ''f'' of the equation is a holomorphic function outside the support of ''μ''.  Moreover, if in an open set ''D'',
 
:<math>d\mu = \frac{1}{2\pi i}\phi \, dz\wedge d\bar{z}</math>
 
for some ''φ'' ∈ ''C''<sup>''k''</sup>(''D'') (''k''&nbsp;≥&nbsp;1), then <math>f(\zeta,\bar{\zeta})</math> is also in ''C''<sup>''k''</sup>(''D'') and satisfies the equation
 
:<math>\frac{\partial f}{\partial\bar{z}} = \phi(z,\bar{z}).</math>
 
The first conclusion is, succinctly, that the [[convolution]] ''μ''∗''k''(''z'') of a compactly supported measure with the '''Cauchy kernel'''
 
:<math>k(z) = \operatorname{p.v.}\frac{1}{z}</math>
 
is a holomorphic function off the support of ''μ''.  Here p.v. denotes the [[Cauchy principal value|principal value]]. The second conclusion asserts that the Cauchy kernel is a [[fundamental solution]] of the Cauchy–Riemann equations. Note that for smooth complex-valued functions ''f'' of compact support on '''C''' the generalized Cauchy integral formula simplifies to
 
:<math>f(\zeta) =  \frac{1}{2\pi i}\iint \frac{\partial f}{\partial \bar{z}}\frac{dz\wedge d\bar{z}}{z-\zeta},</math>
 
and is a restatement of the fact that, considered as a [[distribution (mathematics)|distribution]], <math>(\pi z)^{-1}</math> is a [[fundamental solution]] of the [[Cauchy-Riemann operator]] <math>\partial/\partial\overline{z}</math>.<ref>{{harvnb|Hörmander|1983|p=63,81}}</ref> The generalized Cauchy integral formula can be deduced for any bounded open region ''X'' with C<sup>1</sup> boundary ∂''X'' from this result and the formula for the [[distributional derivative]] of the [[indicator function|characteristic function]] χ<sub>''X''</sub> of ''X'':
 
:<math>  {\partial \chi_X\over \partial \overline z}= {i\over 2} \oint_{\partial X} dz,</math>
 
where the distribution on the right hand side denotes [[contour integration]] along ∂''X''.<ref>{{harvnb|Hörmander|1983|pp=62–63}}</ref>
 
===Several variables===
In [[several complex variables]], the Cauchy integral formula can be generalized to [[polydisc]]s {{harv|Hörmander|1966|loc=Theorem 2.2.1}}.  Let ''D'' be the polydisc given as the [[Cartesian product]] of ''n'' open discs ''D''<sub>1</sub>, ..., ''D''<sub>''n''</sub>:
:<math>D = \prod_{i=1}^n D_i.</math>
Suppose that ''f'' is a holomorphic function in ''D'' continuous on the closure of ''D''. Then
 
:<math>f(\zeta) = \frac{1}{(2\pi i)^n}\int\cdots\iint_{\partial D_1\times\dots\times\partial D_n} \frac{f(z_1,\dots,z_n)}{(z_1-\zeta_1)\dots(z_n-\zeta_n)}dz_1\dots dz_n</math>
 
where ''ζ''=(''ζ''<sub>1</sub>,...,''ζ''<sub>''n''</sub>) ∈ ''D''.
 
===In real algebras===
 
The Cauchy integral formula is generalizable to real vector spaces of two or more dimensions.  The insight into this property comes from [[geometric algebra]], where objects beyond scalars and vectors (such as planar bivectors and volumetric trivectors) are considered, and a proper generalization of [[Stokes theorem]].
 
Geometric calculus defines a derivative operator <math>\nabla = \hat e_i \partial_i</math> under its geometric product—that is, for a <math>k</math>-vector field <math>\psi(\vec r)</math>, the derivative <math>\nabla \psi</math> generally contains terms of grade <math>k+1</math> and <math>k-1</math>.  For example, a vector field (<math>k=1</math>) generally has in its derivative a scalar part, the divergence (<math>k=0</math>), and a bivector part, the curl (<math>k=2</math>).  This particular derivative operator has a [[Green's function]]:
 
:<math>G(\vec r, \vec r') = \frac{1}{S_n} \frac{\vec r - \vec r'}{|\vec r - \vec r'|^n}</math>
 
where <math>S_n</math> is the surface area of a unit ball in the space (that is, <math>S_2=2\pi</math>, the circumference of a circle with radius 1, and <math>S_3 = 4\pi</math>, the surface area of a sphere with radius 1). By definition of a Green's function, <math>\nabla G(\vec r, \vec r') = \delta(\vec r- \vec r')</math>.  It is this useful property that can be used, in conjunction with the generalized Stokes theorem:
 
:<math>\oint_{\partial V} d\vec S \; f(\vec r) = \int_V d\vec V \; \nabla f(\vec r)</math>
 
where, for an <math>n</math>-dimensional vector space, <math>d\vec S</math> is an <math>(n-1)</math>-vector and <math>d\vec V</math> is an <math>n</math>-vector. The function <math>f(\vec r)</math> can, in principle, be composed of any combination of multivectors.  The proof of Cauchy's integral theorem for higher dimensional spaces relies on the using the generalized Stokes theorem on the quantity <math>G(\vec r,\vec r') f(\vec r')</math> and use of the product rule:
 
:<math>\oint_{\partial V'} G(\vec r, \vec r')\;  d\vec S' \; f(\vec r') = \int_V \left([\nabla' G(\vec r, \vec r')] f(\vec r') + G(\vec r, \vec r') \nabla' f(\vec r')\right) \; d\vec V</math>
 
when <math>\nabla \vec f = 0</math>, <math>f(\vec r)</math> is called a ''monogenic function'', the generalization of holomorphic functions to higher-dimensional spaces—indeed, it can be shown that the Cauchy–Riemann condition is just the two-dimensional expression of the monogenic condition. When that condition is met, the second term in the right-hand integral vanishes, leaving only
 
:<math>\oint_{\partial V'} G(\vec r, \vec r')\;  d\vec S' \; f(\vec r') = \int_V [\nabla' G(\vec r, \vec r')] f(\vec r') = -\int_V \delta(\vec r - \vec r') f(\vec r') \; d\vec V =- i_n f(\vec r)</math>
 
where <math>i_n</math> is that algebra's unit <math>n</math>-vector, the [[pseudoscalar]]. The result is
 
:<math>f(\vec r) =- \frac{1}{i_n} \oint_{\partial V} G(\vec r, \vec r')\;  d\vec S \; f(\vec r') = -\frac{1}{i_n} \oint_{\partial V} \frac{\vec r - \vec r'}{S_n |\vec r - \vec r'|^n} \; d\vec S \; f(\vec r')</math>
 
Thus, as in the two-dimensional (complex analysis) case, the value of an analytic (monogenic) function at a point can be found by an integral over the surface surrounding the point, and this is valid not only for scalar functions but vector and general multivector functions as well.
 
==See also==
*[[Cauchy&ndash;Riemann equations]]
*[[Methods of contour integration]]
*[[Nachbin's theorem]]
*[[Morera's theorem]]
*[[Mittag-Leffler's theorem]]
*[[Green's function]] generalizes this idea to the non-linear setup
*[[Schwarz integral formula]]
*[[Parseval–Gutzmer formula]]
 
==Notes==
{{reflist}}
 
==References==
* {{citation|first=Lars|last=Ahlfors|authorlink=Lars Ahlfors|title=Complex analysis|publisher=McGraw Hill|edition=3rd|year=1979|isbn=978-0-07-000657-7}}.
* [http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:36.0454.04] [http://archive.numdam.org/ARCHIVE/AFST/AFST_1905_2_7_3/AFST_1905_2_7_3_265_0/AFST_1905_2_7_3_265_0.pdf] D. Pompeiu, ''Sur la continuité des fonctions de variables complexes'', Annales de la faculté des sciences de Toulouse Sér. 2, 7 no. 3 (1905), p.&nbsp;265&ndash;315
*{{citation|first=E.C.|last=Titchmarsh|title=Theory of functions|publisher=[[Oxford University Press]]|year=1939|edition=2nd}}
* {{citation|first=Lars|last=Hörmander|authorlink=Lars Hörmander|title=An introduction to complex analysis in several variables|publisher=Van Nostrand|year=1966}}
* {{citation|first=Lars|last=Hörmander|authorlink=Lars Hörmander|title=The Analysis of Linear Partial Differential Operators I|year=1983|publisher=Springer|isbn=3-540-12104-8}}
* {{citation |last1=Doran|first1=Chris |last2=Lasenby |first2=Anthony |title=Geometric Algebra for Physicists | publisher=Cambridge University Press|year=2003 |isbn=978-0-521-71595-9 }}
 
== External links ==
* {{springer|title=Cauchy integral|id=p/c020890}}
* {{MathWorld | urlname= CauchyIntegralFormula | title= Cauchy Integral Formula }}
* [http://math.fullerton.edu/mathews/c2003/IntegralRepresentationMod.html Cauchy Integral Formula Module by John H. Mathews]
 
{{DEFAULTSORT:Cauchy's Integral Formula}}
[[Category:Complex analysis]]
[[Category:Theorems in complex analysis]]

Revision as of 17:56, 22 January 2014

Template:Distinguish

In mathematics, Cauchy's integral formula, named after Augustin-Louis Cauchy, is a central statement in complex analysis. It expresses the fact that a holomorphic function defined on a disk is completely determined by its values on the boundary of the disk, and it provides integral formulas for all derivatives of a holomorphic function. Cauchy's formula shows that, in complex analysis, "differentiation is equivalent to integration": complex differentiation, like integration, behaves well under uniform limits – a result denied in real analysis.

Theorem

Suppose U is an open subset of the complex plane C, f : UC is a holomorphic function and the closed disk D = { z : | zz0| ≤ r} is completely contained in U. Let be the circle forming the boundary of D. Then for every a in the interior of D:

where the contour integral is taken counter-clockwise.

The proof of this statement uses the Cauchy integral theorem and similarly only requires f to be complex differentiable. Since the reciprocal of the denominator of the integrand in Cauchy's integral formula can be expanded as a power series in the variable (a − z0), it follows that holomorphic functions are analytic. In particular f is actually infinitely differentiable, with

This formula is sometimes referred to as Cauchy's differentiation formula.

The circle γ can be replaced by any closed rectifiable curve in U which has winding number one about a. Moreover, as for the Cauchy integral theorem, it is sufficient to require that f be holomorphic in the open region enclosed by the path and continuous on its closure.

Proof sketch

By using the Cauchy integral theorem, one can show that the integral over C (or the closed rectifiable curve) is equal to the same integral taken over an arbitrarily small circle around a. Since f(z) is continuous, we can choose a circle small enough on which f(z) is arbitrarily close to f(a). On the other hand, the integral

over any circle C centered at a. This can be calculated directly via a parametrization (integration by substitution) where 0 ≤ t ≤ 2π and ε is the radius of the circle.

Letting ε → 0 gives the desired estimate

Example

Surface of the real part of the function g(z) = z2 / (z2 + 2z + 2) and its singularities, with the contours described in the text.

Consider the function

and the contour described by |z| = 2, call it C.

To find the integral of g(z) around the contour, we need to know the singularities of g(z). Observe that we can rewrite g as follows:

where

Clearly the poles become evident, their moduli are less than 2 and thus lie inside the contour and are subject to consideration by the formula. By the Cauchy-Goursat theorem, we can express the integral around the contour as the sum of the integral around z1 and z2 where the contour is a small circle around each pole. Call these contours C1 around z1 and C2 around z2.

Now, around C1, f is analytic (since the contour does not contain the other singularity), and this allows us to write f in the form we require, namely:

and now


Doing likewise for the other contour:


The integral around the original contour C then is the sum of these two integrals:


An elementary trick using partial fraction decomposition:

Consequences

The integral formula has broad applications. First, it implies that a function which is holomorphic in an open set is in fact infinitely differentiable there. Furthermore, it is an analytic function, meaning that it can be represented as a power series. The proof of this uses the dominated convergence theorem and the geometric series applied to

The formula is also used to prove the residue theorem, which is a result for meromorphic functions, and a related result, the argument principle. It is known from Morera's theorem that the uniform limit of holomorphic functions is holomorphic. This can also be deduced from Cauchy's integral formula: indeed the formula also holds in the limit and the integrand, and hence the integral, can be expanded as a power series. In addition the Cauchy formulas for the higher order derivatives show that all these derivatives also converge uniformly.

The analog of the Cauchy integral formula in real analysis is the Poisson integral formula for harmonic functions; many of the results for holomorphic functions carry over to this setting. No such results, however, are valid for more general classes of differentiable or real analytic functions. For instance, the existence of the first derivative of a real function need not imply the existence of higher order derivatives, nor in particular the analyticity of the function. Likewise, the uniform limit of a sequence of (real) differentiable functions may fail to be differentiable, or may be differentiable but with a derivative which is not the limit of the derivatives of the members of the sequence.

Another consequence is that if Buying, selling and renting HDB and personal residential properties in Singapore are simple and transparent transactions. Although you are not required to engage a real property salesperson (generally often known as a "public listed property developers In singapore agent") to complete these property transactions, chances are you'll think about partaking one if you are not accustomed to the processes concerned.

Professional agents are readily available once you need to discover an condominium for hire in singapore In some cases, landlords will take into account you more favourably in case your agent comes to them than for those who tried to method them by yourself. You need to be careful, nevertheless, as you resolve in your agent. Ensure that the agent you are contemplating working with is registered with the IEA – Institute of Estate Brokers. Whereas it might sound a hassle to you, will probably be worth it in the end. The IEA works by an ordinary algorithm and regulations, so you'll protect yourself in opposition to probably going with a rogue agent who prices you more than they should for his or her service in finding you an residence for lease in singapore.

There isn't any deal too small. Property agents who are keen to find time for any deal even if the commission is small are the ones you want on your aspect. Additionally they present humbleness and might relate with the typical Singaporean higher. Relentlessly pursuing any deal, calling prospects even without being prompted. Even if they get rejected a hundred times, they still come again for more. These are the property brokers who will find consumers what they need eventually, and who would be the most successful in what they do. 4. Honesty and Integrity

This feature is suitable for you who need to get the tax deductions out of your PIC scheme to your property agency firm. It's endorsed that you visit the correct site for filling this tax return software. This utility must be submitted at the very least yearly to report your whole tax and tax return that you're going to receive in the current accounting 12 months. There may be an official website for this tax filling procedure. Filling this tax return software shouldn't be a tough thing to do for all business homeowners in Singapore.

A wholly owned subsidiary of SLP Worldwide, SLP Realty houses 900 associates to service SLP's fast rising portfolio of residential tasks. Real estate is a human-centric trade. Apart from offering comprehensive coaching applications for our associates, SLP Realty puts equal emphasis on creating human capabilities and creating sturdy teamwork throughout all ranges of our organisational hierarchy. Worldwide Presence At SLP International, our staff of execs is pushed to make sure our shoppers meet their enterprise and investment targets. Under is an inventory of some notable shoppers from completely different industries and markets, who've entrusted their real estate must the expertise of SLP Worldwide.

If you're looking for a real estate or Singapore property agent online, you merely need to belief your instinct. It is because you don't know which agent is sweet and which agent will not be. Carry out research on a number of brokers by looking out the internet. As soon as if you find yourself certain that a selected agent is dependable and trustworthy, you'll be able to choose to utilize his partnerise find you a house in Singapore. More often than not, a property agent is considered to be good if she or he places the contact data on his web site. This is able to imply that the agent does not thoughts you calling them and asking them any questions regarding properties in Singapore. After chatting with them you too can see them of their office after taking an appointment.

Another method by way of which you could find out whether the agent is sweet is by checking the feedback, of the shoppers, on the website. There are various individuals would publish their comments on the web site of the Singapore property agent. You can take a look at these feedback and the see whether it will be clever to hire that specific Singapore property agent. You may even get in contact with the developer immediately. Many Singapore property brokers know the developers and you may confirm the goodwill of the agent by asking the developer. is holomorphic in |z| < R and 0 < r < R then the coefficients Buying, selling and renting HDB and personal residential properties in Singapore are simple and transparent transactions. Although you are not required to engage a real property salesperson (generally often known as a "public listed property developers In singapore agent") to complete these property transactions, chances are you'll think about partaking one if you are not accustomed to the processes concerned.

Professional agents are readily available once you need to discover an condominium for hire in singapore In some cases, landlords will take into account you more favourably in case your agent comes to them than for those who tried to method them by yourself. You need to be careful, nevertheless, as you resolve in your agent. Ensure that the agent you are contemplating working with is registered with the IEA – Institute of Estate Brokers. Whereas it might sound a hassle to you, will probably be worth it in the end. The IEA works by an ordinary algorithm and regulations, so you'll protect yourself in opposition to probably going with a rogue agent who prices you more than they should for his or her service in finding you an residence for lease in singapore.

There isn't any deal too small. Property agents who are keen to find time for any deal even if the commission is small are the ones you want on your aspect. Additionally they present humbleness and might relate with the typical Singaporean higher. Relentlessly pursuing any deal, calling prospects even without being prompted. Even if they get rejected a hundred times, they still come again for more. These are the property brokers who will find consumers what they need eventually, and who would be the most successful in what they do. 4. Honesty and Integrity

This feature is suitable for you who need to get the tax deductions out of your PIC scheme to your property agency firm. It's endorsed that you visit the correct site for filling this tax return software. This utility must be submitted at the very least yearly to report your whole tax and tax return that you're going to receive in the current accounting 12 months. There may be an official website for this tax filling procedure. Filling this tax return software shouldn't be a tough thing to do for all business homeowners in Singapore.

A wholly owned subsidiary of SLP Worldwide, SLP Realty houses 900 associates to service SLP's fast rising portfolio of residential tasks. Real estate is a human-centric trade. Apart from offering comprehensive coaching applications for our associates, SLP Realty puts equal emphasis on creating human capabilities and creating sturdy teamwork throughout all ranges of our organisational hierarchy. Worldwide Presence At SLP International, our staff of execs is pushed to make sure our shoppers meet their enterprise and investment targets. Under is an inventory of some notable shoppers from completely different industries and markets, who've entrusted their real estate must the expertise of SLP Worldwide.

If you're looking for a real estate or Singapore property agent online, you merely need to belief your instinct. It is because you don't know which agent is sweet and which agent will not be. Carry out research on a number of brokers by looking out the internet. As soon as if you find yourself certain that a selected agent is dependable and trustworthy, you'll be able to choose to utilize his partnerise find you a house in Singapore. More often than not, a property agent is considered to be good if she or he places the contact data on his web site. This is able to imply that the agent does not thoughts you calling them and asking them any questions regarding properties in Singapore. After chatting with them you too can see them of their office after taking an appointment.

Another method by way of which you could find out whether the agent is sweet is by checking the feedback, of the shoppers, on the website. There are various individuals would publish their comments on the web site of the Singapore property agent. You can take a look at these feedback and the see whether it will be clever to hire that specific Singapore property agent. You may even get in contact with the developer immediately. Many Singapore property brokers know the developers and you may confirm the goodwill of the agent by asking the developer. satisfy Cauchy's inequality[1]

Generalizations

Smooth functions

A version of Cauchy's integral formula is the Cauchy-Pompeiu formula,[2] and holds for smooth functions as well, as it is based on Stokes' theorem. Let D be a disc in C and suppose that f is a complex-valued C1 function on the closure of D. Then Template:Harv

One may use this representation formula to solve the inhomogeneous Cauchy–Riemann equations in D. Indeed, if φ is a function in D, then a particular solution f of the equation is a holomorphic function outside the support of μ. Moreover, if in an open set D,

for some φCk(D) (k ≥ 1), then is also in Ck(D) and satisfies the equation

The first conclusion is, succinctly, that the convolution μk(z) of a compactly supported measure with the Cauchy kernel

is a holomorphic function off the support of μ. Here p.v. denotes the principal value. The second conclusion asserts that the Cauchy kernel is a fundamental solution of the Cauchy–Riemann equations. Note that for smooth complex-valued functions f of compact support on C the generalized Cauchy integral formula simplifies to

and is a restatement of the fact that, considered as a distribution, is a fundamental solution of the Cauchy-Riemann operator .[3] The generalized Cauchy integral formula can be deduced for any bounded open region X with C1 boundary ∂X from this result and the formula for the distributional derivative of the characteristic function χX of X:

where the distribution on the right hand side denotes contour integration along ∂X.[4]

Several variables

In several complex variables, the Cauchy integral formula can be generalized to polydiscs Template:Harv. Let D be the polydisc given as the Cartesian product of n open discs D1, ..., Dn:

Suppose that f is a holomorphic function in D continuous on the closure of D. Then

where ζ=(ζ1,...,ζn) ∈ D.

In real algebras

The Cauchy integral formula is generalizable to real vector spaces of two or more dimensions. The insight into this property comes from geometric algebra, where objects beyond scalars and vectors (such as planar bivectors and volumetric trivectors) are considered, and a proper generalization of Stokes theorem.

Geometric calculus defines a derivative operator under its geometric product—that is, for a -vector field , the derivative generally contains terms of grade and . For example, a vector field () generally has in its derivative a scalar part, the divergence (), and a bivector part, the curl (). This particular derivative operator has a Green's function:

where is the surface area of a unit ball in the space (that is, , the circumference of a circle with radius 1, and , the surface area of a sphere with radius 1). By definition of a Green's function, . It is this useful property that can be used, in conjunction with the generalized Stokes theorem:

where, for an -dimensional vector space, is an -vector and is an -vector. The function can, in principle, be composed of any combination of multivectors. The proof of Cauchy's integral theorem for higher dimensional spaces relies on the using the generalized Stokes theorem on the quantity and use of the product rule:

when , is called a monogenic function, the generalization of holomorphic functions to higher-dimensional spaces—indeed, it can be shown that the Cauchy–Riemann condition is just the two-dimensional expression of the monogenic condition. When that condition is met, the second term in the right-hand integral vanishes, leaving only

where is that algebra's unit -vector, the pseudoscalar. The result is

Thus, as in the two-dimensional (complex analysis) case, the value of an analytic (monogenic) function at a point can be found by an integral over the surface surrounding the point, and this is valid not only for scalar functions but vector and general multivector functions as well.

See also

Notes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

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.
  • [1] [2] D. Pompeiu, Sur la continuité des fonctions de variables complexes, Annales de la faculté des sciences de Toulouse Sér. 2, 7 no. 3 (1905), p. 265–315
  • 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

External links

  • Other Sports Official Kull from Drumheller, has hobbies such as telescopes, property developers in singapore and crocheting. Identified some interesting places having spent 4 months at Saloum Delta.

    my web-site http://himerka.com/


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  • Cauchy Integral Formula Module by John H. Mathews
  1. Template:Harvnb
  2. [3] [4] D. Pompeiu, Sur la continuité des fonctions de variables complexes, Annales de la faculté des sciences de Toulouse Sér. 2, 7 no. 3 (1905), p. 265–315
  3. Template:Harvnb
  4. Template:Harvnb