proposition: Lemma EqualizerArrowMonic {y z : C} {f g : y --> z} (E : Equalizer f g ) : Monic _ E y.
proof: Proof. exact (make_Monic C (EqualizerArrow E) (EqualizerArrowisMonic E)). Defined.
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