fact: Definition hom_first_isomorphism : Homomorphism (A / cong_ker f) (B && in_image_hom f) := BuildHomomorphism def_first_isomorphism.
imports: HSet Colimits.Quotient Modalities.ReflectiveSubuniverse Classes.interfaces.canonical_names Classes.theory.ua_isomorphic Classes.theory.ua_subalgebra Classes.theory.ua_quotient_algebra