C = source f
Given a complex map $f : C \to D$ this method returns the chain complex $C$.
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The differential in a complex is a map of chain complexes.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Complexes/ChainComplexMapDoc.m2:637:0.