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