nLab
horseshoe lemma

Context

Homological algebra

homological algebra

and

nonabelian homological algebra

Context

Basic definitions

Stable homotopy theory notions

Constructions

Lemmas

diagram chasing

Homology theories

Theorems

Contents

Idea

A basic lemma in homological algebra.

References

The horseshoe lemma appears as lemma 2.2.8 in

Revised on August 27, 2012 15:31:00 by Urs Schreiber (89.204.137.217)