dd^C
dd_C
A chain complex is a sequence of modules connected by homomorphisms, called differentials, such that the composition of any two consecutive maps is zero.
One can access the differential of a complex as follows.
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The composition of the differential with itself is zero.
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The individual maps between terms are indexed by their source.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Complexes/ChainComplexDoc.m2:856:0.