fact: Definition def_first_isomorphism (s : Sort σ) : (A / cong_ker f) s → (B && in_image_hom f) s.
imports: HSet Colimits.Quotient Modalities.ReflectiveSubuniverse Classes.interfaces.canonical_names Classes.theory.ua_isomorphic Classes.theory.ua_subalgebra Classes.theory.ua_quotient_algebra