proposition: Lemma isiso_from_Coequalizer_to_Coequalizer {y z : C} {f g : y --> z} (E E' : Coequalizer f g) : is_iso (from_Coequalizer_to_Coequalizer E E').
proof: Proof. apply (is_iso_qinv _ (from_Coequalizer_to_Coequalizer E' E)). apply are_inverses_from_Coequalizer_to_Coequalizer. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Epis UniMath.CategoryTheory.Limits.BinCoproducts UniMath.CategoryTheory.Retracts