fact: Definition ab_pushout_subgroup {A B C : AbGroup} (f : A $-> B) (g : A $-> C) : Subgroup (ab_biprod B C) := grp_image (ab_biprod_corec (ab_homo_negation $o f) g).
imports: Basics Types Truncations.Core Modalities.ReflectiveSubuniverse WildCat.Core HSet Algebra.Groups.Image Algebra.Groups.QuotientGroup AbGroups.AbelianGroup AbGroups.Biproduct