fact: Definition hom_second_isomorphism : Homomorphism ((A&&P) / Ψ) ((A/Φ) && Q) := BuildHomomorphism def_second_isomorphism.
imports: HSet Colimits.Quotient Classes.interfaces.canonical_names Classes.theory.ua_isomorphic Classes.theory.ua_subalgebra Classes.theory.ua_quotient_algebra