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Short five lemma

 Home Mathematics Fields of mathematics Fields of abstract algebra Homological algebra
 0 By others on same topic  0 Discussions  1970-01-01  See my version
The Short Five Lemma is a tool in algebraic topology, specifically in the context of homological algebra and the theory of derived functors. It deals with the properties of cohomology in the setting of a commutative diagram of chain complexes and can be used to derive relationships between cohomology groups of various objects.

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