image f
The image of $f$ is the subcomplex of the target of $f$ whose faces are of the form $f(F)$ for some face $F$ in the source of $f$.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/SimplicialComplexes/Documentation.m2:4297:0.