A characterization of long exact sequences coming from the snake lemma
arXiv:0906.1286
Abstract
Given an abelian category, we characterize the long exact sequences of length six which can be obtained from the snake lemma. Equivalently, these are the long exact sequences which arise as the homology of a triangle in the corresponding derived bounded category.
10 pages, minor corrections, in particular making the arguments regarding the construction of diagrams (Δ) and (Ξ) more precise