The snake lemma is a tool used in mathematics, particularly homological algebra, 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.
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Famous quotes containing the word snake:
“The snake that cannot shed its skin perishes. Likewise those spirits who are prevented from changing their opinions; they cease to be spirits.”
—Friedrich Nietzsche (1844–1900)