proposition: Lemma isiso_from_Equalizer_to_Equalizer {y z : C} {f g : y --> z} (E E' : Equalizer f g) : is_iso (from_Equalizer_to_Equalizer E E').
proof: Proof. apply (is_iso_qinv _ (from_Equalizer_to_Equalizer E' E)). apply are_inverses_from_Equalizer_to_Equalizer. 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