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Commit 2020-12-05 04:54 de7dbbbd

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feat(algebra/group): composition of monoid homs as "bilinear" monoid hom (#5202)

Estimated changes

Modified src/algebra/group/hom.lean

added def monoid_hom.comp_hom

added theorem monoid_hom.comp_mul

added theorem monoid_hom.comp_one

added theorem monoid_hom.mul_comp

added theorem monoid_hom.one_comp

added theorem one_hom.comp_one

added theorem one_hom.one_comp

Modified src/category_theory/preadditive/default.lean