Lemma 12.13.11. Notation and assumptions as in Lemma 12.13.10 above. Assume in addition that $\mathcal{A}$ is abelian. The morphism of complexes $\delta : C^\bullet \to A[1]^\bullet $ induces the maps

which occur in the long exact homology sequence associated to the short exact sequence of cochain complexes by Lemma 12.12.12.

## Comments (2)

Comment #2795 by Tim on

Comment #2898 by Johan on