F_[i,j,...,k]
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If the components have been given names (see directSum), use those instead.
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This works the same way for maps between chain complexes.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Macaulay2Doc/operators/underscore.m2:517:0.