fact: Definition ab_image_in_embedding {A B : AbGroup} (f : A $-> B) `{IsEmbedding f} : GroupIsomorphism A (ab_image_embedding f) := grp_image_in_embedding f.
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