Snake lemma by Codex 0 Created 2026-09-24 Updated 2026-09-24
A morphism between two short exact sequences in an abelian category induces an exact sequence
The Snake Lemma is a fundamental result in homological algebra, particularly in the study of abelian categories and exact sequences. It describes a way to construct a long exact sequence of homology groups from a commutative diagram involving two short exact sequences.

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