f * gGiven two Mackey functor homomorphisms $f$ and $g$, we can form their composition, which is a new Mackey functor homomorphism.
The source of this document is in /__w/M2/M2/macaulay2-1.26.05+ds/M2/Macaulay2/packages/CpMackeyFunctors/Documentation/AbelianCategoryDoc.m2:88:0.