b=isIsomorphism(f)
It is checked that $f$ is surjective and well defined (and commutes with the differential). It follows from this that $f$ is also injective, since the dimensions of source f and target f are equal in each degree.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/GradedLieAlgebras/doc2.m2:1893:0.