fact: Definition ab_mul_nat_homo {A B : AbGroup} (f : GroupHomomorphism A B) (n : nat) : f o ab_mul_nat n == ab_mul_nat n o f := grp_pow_homo f n.
imports: Basics Types Classes.interfaces.canonical_names (Zero, zero) Classes.interfaces.abstract_algebra (IsAbGroup(..), abgroup_group, abgroup_commutative) Algebra.Groups.Group Algebra.Groups.Subgroup Algebra.Groups.QuotientGroup WildCat