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De Rham cohomology information


Vector field corresponding to a differential form on the punctured plane that is closed but not exact, showing that the de Rham cohomology of this space is non-trivial.

In mathematics, de Rham cohomology (named after Georges de Rham) is a tool belonging both to algebraic topology and to differential topology, capable of expressing basic topological information about smooth manifolds in a form particularly adapted to computation and the concrete representation of cohomology classes. It is a cohomology theory based on the existence of differential forms with prescribed properties.

On any smooth manifold, every exact form is closed, but the converse may fail to hold. Roughly speaking, this failure is related to the possible existence of "holes" in the manifold, and the de Rham cohomology groups comprise a set of topological invariants of smooth manifolds that precisely quantify this relationship.[1]

The integration on forms concept is of fundamental importance in differential topology, geometry, and physics, and also yields one of the most important examples of cohomology, namely de Rham cohomology, which (roughly speaking) measures precisely the extent to which the fundamental theorem of calculus fails in higher dimensions and on general manifolds.
— Terence Tao, Differential Forms and Integration[2]
  1. ^ Lee 2013, p. 440.
  2. ^ Tao, Terence (2007) "Differential Forms and Integration" Princeton Companion to Mathematics 2008. Timothy Gowers, ed.

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De Rham cohomology

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study algebraic geometry, and it built on the work of Georges de Rham on de Rham cohomology. It has major applications in two settings: Riemannian manifolds...

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Schwartz's recent work on distributions. De Rham's work on these topics is now usually formulated in the language of cohomology theory, although he did not do so...

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smooth manifold X, de Rham's theorem says that the singular cohomology of X with real coefficients is isomorphic to the de Rham cohomology of X, defined using...

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compact support, and d be the standard exterior derivative. Then the de Rham cohomology groups with compact support H c q ( X ) {\displaystyle H_{\mathrm...

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Chain complex

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^{2}(M)}{\stackrel {d}{\to }}\ \Omega ^{3}(M)\to \cdots } The cohomology of this complex is called the de Rham cohomology of M. Locally constant functions are designated...

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possible to calculate its cohomology from the Lie algebra. This can be done as follows. Its cohomology is the de Rham cohomology of the complex of differential...

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and differential geometry, Dolbeault cohomology (named after Pierre Dolbeault) is an analog of de Rham cohomology for complex manifolds. Let M be a complex...

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Ddbar lemma

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lemma (pronounced ddbar lemma) is a mathematical lemma about the de Rham cohomology class of a complex differential form. The ∂ ∂ ¯ {\displaystyle \partial...

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{\displaystyle \ell } , crystalline cohomology. The proofs of the axioms for Betti cohomology and de Rham cohomology are comparatively easy and classical...

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Gysin homomorphism

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k + 1 cohomology class e called the Euler class of the bundle. Discussion of the sequence is clearest with de Rham cohomology. There cohomology classes...

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Cohomology ring

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Here 'cohomology' is usually understood as singular cohomology, but the ring structure is also present in other theories such as de Rham cohomology. It...

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Closed and exact differential forms

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this kind on an arbitrary differentiable manifold are the subject of de Rham cohomology, which allows one to obtain purely topological information using differential...

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Exterior derivative

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as the differential (coboundary) to define de Rham cohomology on a manifold. The k-th de Rham cohomology (group) is the vector space of closed k-forms...

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Generalized Stokes theorem

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k-chains. Stokes' theorem says that this is a chain map from de Rham cohomology to singular cohomology with real coefficients; the exterior derivative, d, behaves...

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Group cohomology

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cohomology groups in the Hn(G, M) → Hn(G, N). Similarly to other cohomology theories in topology and geometry, such as singular cohomology or de Rham...

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Differential form

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complex is called the de Rham complex, and its cohomology is by definition the de Rham cohomology of M. By the Poincaré lemma, the de Rham complex is locally...

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Jacobian ideal

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}^{p}(\log X))\cong {\text{Prim}}^{p-1,q}(X)} . In turns out the de Rham cohomology group H d R n + 1 ( P n + 1 − X ) {\displaystyle H_{dR}^{n+1}(\mathbb...

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Hodge conjecture

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visualized. More specifically, the conjecture states that certain de Rham cohomology classes are algebraic; that is, they are sums of Poincaré duals of...

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Cyclic homology

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cyclic homology and cyclic cohomology are certain (co)homology theories for associative algebras which generalize the de Rham (co)homology of manifolds...

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