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Commit 2020-11-11 10:50 3d6291ea

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chore(algebra/group/with_one): Use bundled morphisms (#4957) The comment "We have no bundled semigroup homomorphisms" has become false, these exist as mul_hom. This also adds with_one.coe_mul_hom and with_zero.coe_add_hom

Estimated changes

modified def with_one.lift
modified theorem with_one.lift_coe
modified theorem with_one.lift_one
modified theorem with_one.lift_unique
modified def with_one.map