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In [[algebraic topology]], several types of products are defined on homological and cohomological theories.
 
==The cross product==
 
<math>H_p(X) \otimes H_q(Y) \to H_{p+q}(X\times Y)</math>
 
==The cap product==
{{Main| Cap product}}
 
:<math>\frown\ : H_p(X;R)\times H^q(X;R) \rightarrow H_{p-q}(X;R)</math>
 
==The slant product==
{{Main| slant product}}
 
:<math>\frown\ : H_p(X;R)\times H^q(X\times Y;R) \rightarrow H^{q-p}(Y;R)</math>
 
==The cup product==
{{Main| cup product}}
 
:<math>H^p(X) \otimes H^q(X) \to H^{p+q}(X)</math>
 
This product can be understood as induced by the exterior product of [[differential form]]s in [[de Rham cohomology]]. It makes the singular cohomology of a connected manifold into a unitary supercommutative ring.
 
==See also==
*[[Singular homology]]
*[[Differential graded algebra]]: the algebraic structure arising on the cochain level for the cup product
*[[Poincaré duality]]: swaps some of these
 
*[[Intersection theory]]: for a similar theory in [[algebraic geometry]]
 
[[Category:Algebraic topology]]
[[Category:Homology theory]]
[[Category:Binary operations]]

Revision as of 00:47, 12 December 2013

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In algebraic topology, several types of products are defined on homological and cohomological theories.

The cross product

The cap product

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The slant product

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.

The cup product

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.

This product can be understood as induced by the exterior product of differential forms in de Rham cohomology. It makes the singular cohomology of a connected manifold into a unitary supercommutative ring.

See also