fact: Definition CokernelEpiComp {x y z : C} (E : Epi C x y) (f : y --> z) (CK : Cokernel Z (E · f)) : 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