fact: Definition CoequalizerCokernel {x y : ob C} {f : x --> y} (CE : Coequalizer f (ZeroArrow Z _ _)) : Cokernel Z f.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Epis UniMath.CategoryTheory.Limits.Coequalizers UniMath.CategoryTheory.Limits.Zero