Snake lemma (nonfiction)

In mathematics, the snake lemma is a tool used to construct long exact sequences.

The snake lemma is valid in every abelian category and is a crucial tool in homological algebra and its applications, for instance in algebraic topology.

Homomorphisms constructed with its help are generally called connecting homomorphisms.

Fiction cross-reference

• Snake lemma

Nonfiction cross-reference

External links:

• Snake lemma @ Wikipedia
• Homological algebra @ Wikpedia
• Algebraic topology @ Wikipedia
• Exact sequence @ Wikipedia