isQuasiIsomorphism f
The cone of a map $f \colon C \to D$ is acyclic exactly when $f$ is a quasi-isomorphism.
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XXX TODO. Free resolutions of complexes produce quasi isomorphisms. (use example to doc of (freeResolution, Complex)).
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Complexes/ChainComplexMapDoc.m2:3230:0.