mu = exteriorMultiplication nThe basis of each $\wedge^p k^n$ is given in lex order.
This is not the order of the basis in the output of koszulComplex ff; rather, use trueKoszul ff.
The object exteriorMultiplication is a method function.
The source of this document is in /__w/M2/M2/macaulay2-1.26.05+ds/M2/Macaulay2/packages/HigherCIOperators.m2:274:0.