proposition: Lemma EqualizerArrowisMonic {y z : C} {f g : y --> z} (E : Equalizer f g ) : isMonic (EqualizerArrow E).
proof: Proof. apply make_isMonic. intros z0 g0 h X. apply (EqualizerInsEq E). apply X. Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Monics UniMath.CategoryTheory.Retracts