acyclic assembly lemma

The **Acyclic Assembly Lemma** gives conditions for the total complex of a double complex of modules over a ring to be acyclic.

A full statement and proof can be found in An Introduction to Homological Algebra by Chuck Weibel on pages 59 and 60 (Lemma 2.7.3).

- Charles Weibel,
*An introduction to homological algebra*, Cambridge Studies in Adv. Math. 38, CUP 1994

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