Corollaire
Tag 0DSD, permanent. Cite it as [Bourbaki, Tag 0DSD].
Algebra, chapter X, § 2. Complexes de A-modules
Pour que u soit un homologisme, il faut et il suffit que Con (u) soit d'homologie nulle.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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