Methanol (data page): Difference between revisions
Standard enthalpy change appears to be 3177.3 , see : http://en.wikipedia.org/wiki/Standard_enthalpy_change_of_fusion. Hence, Standard entropy change is 3177.3/175.55 |
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{{distinguish|Inner product}} | |||
In [[mathematics]], the '''interior product''' is a [[graded algebra|degree]] −1 [[antiderivation]] on the [[exterior algebra]] of [[differential form]]s on a [[smooth manifold]]. The interior product, named in opposition to the [[exterior product]], is also called interior or inner multiplication, or the inner derivative or derivation, but should not be confused with an [[inner product]]. The interior product ''ι''<sub>''X''</sub>''ω'' is sometimes written as ''X'' {{Unicode|⨼}} ''ω''; this character is U+2A3C in [[Unicode]]. | |||
==Definition== | |||
The interior product is defined to be the [[tensor contraction|contraction]] of a [[differential form]] with a [[vector field]]. Thus if ''X'' is a vector field on the [[manifold]] ''M'', then | |||
:<math>\iota_X\colon \Omega^p(M) \to \Omega^{p-1}(M)</math> | |||
is the [[Map (mathematics)|map]] which sends a ''p''-form ''ω'' to the (''p''−1)-form ''ι''<sub>''X''</sub>''ω'' defined by the property that | |||
:<math>( \iota_X\omega )(X_1,\ldots,X_{p-1})=\omega(X,X_1,\ldots,X_{p-1})</math> | |||
for any vector fields ''X''<sub>1</sub>,..., ''X''<sub>''p''−1</sub>. | |||
The interior product is the unique [[derivation (algebra)|antiderivation]] of degree −1 on the [[exterior algebra]] such that on one-forms ''α'' | |||
:<math>\displaystyle\iota_X \alpha = \alpha(X) = \langle \alpha,X \rangle</math>, | |||
the duality pairing between ''α'' and the vector ''X''. Explicitly, if ''β'' is a ''p''-form and γ is a ''q''-form, then | |||
:<math> \iota_X(\beta\wedge\gamma) = (\iota_X\beta)\wedge\gamma+(-1)^p\beta\wedge(\iota_X\gamma). </math> | |||
The above relation says that the interior product obeys a graded [[Product rule|Leibniz rule]]. An operation equipped with linearity and a Leibniz rule is often called a derivative. The interior product is also known as the interior derivative. | |||
==Properties== | |||
By antisymmetry of forms, | |||
:<math> \iota_X \iota_Y \omega = - \iota_Y \iota_X^{ } \omega </math> | |||
and so <math> \iota_X^2 = 0 </math>. This may be compared to the [[exterior derivative]] ''d'' which has the property ''d''<sup>2</sup> = 0. The interior product relates the [[exterior derivative]] and [[Lie derivative]] of differential forms by '''''Cartan's identity''''': | |||
:<math> \mathcal L_X\omega = \mathrm d (\iota_X \omega) + \iota_X \mathrm d\omega. </math> | |||
This identity defines a duality between the exterior and interior derivatives. Cartan's identity is important in [[symplectic geometry]] and [[general relativity]]: see [[moment map]]. | |||
The interior product with respect to the commutator of two vector fields <math>X,Y</math> satisfies the identity | |||
:<math> \iota_{[X,Y]}=\mathcal L_X \iota_Y-\iota_Y \mathcal L_X. </math> | |||
==See also== | |||
* [[Inner product]] | |||
* [[Tensor contraction]] | |||
{{DEFAULTSORT:Interior Product}} | |||
[[Category:Differential forms]] | |||
[[Category:Multilinear algebra]] | |||
{{differential-geometry-stub}} |
Revision as of 03:16, 26 January 2014
Template:Distinguish
In mathematics, the interior product is a degree −1 antiderivation on the exterior algebra of differential forms on a smooth manifold. The interior product, named in opposition to the exterior product, is also called interior or inner multiplication, or the inner derivative or derivation, but should not be confused with an inner product. The interior product ιXω is sometimes written as X PROPERTY builders did not have the simplest year, what with the cooling measures imposed in January and the loan curbs in June, but some still managed to do effectively while others made their first foray abroad.
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Definition
The interior product is defined to be the contraction of a differential form with a vector field. Thus if X is a vector field on the manifold M, then
is the map which sends a p-form ω to the (p−1)-form ιXω defined by the property that
for any vector fields X1,..., Xp−1.
The interior product is the unique antiderivation of degree −1 on the exterior algebra such that on one-forms α
the duality pairing between α and the vector X. Explicitly, if β is a p-form and γ is a q-form, then
The above relation says that the interior product obeys a graded Leibniz rule. An operation equipped with linearity and a Leibniz rule is often called a derivative. The interior product is also known as the interior derivative.
Properties
By antisymmetry of forms,
and so . This may be compared to the exterior derivative d which has the property d2 = 0. The interior product relates the exterior derivative and Lie derivative of differential forms by Cartan's identity:
This identity defines a duality between the exterior and interior derivatives. Cartan's identity is important in symplectic geometry and general relativity: see moment map. The interior product with respect to the commutator of two vector fields satisfies the identity