chain-deformation retract

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Excision theorem — In algebraic topology, a branch of mathematics, the Excision Theorem is a useful theorem about relative homology mdash;given topological spaces X and subspaces A and U such that U is also a subspace of A , the theorem says that under certain… … Wikipedia
Mayer–Vietoris sequence — In mathematics, particularly algebraic topology and homology theory, the Mayer–Vietoris sequence is an algebraic tool to help compute algebraic invariants of topological spaces, known as their homology and cohomology groups. The result is due to… … Wikipedia
Théorème d'excision — Le théorème d excision est un théorème utile en topologie algébrique sur l homologie relative (en) : étant donnés un espace topologique X et des sous espaces A et U tels que U soit aussi un sous espace de A, le théorème énonce que sous… … Wikipédia en Français
Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with … Wikipedia

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