proposition: Lemma isCokernel_paths {x y z : C} (f : x --> y) (g : y --> z) (H H' : f · g = (ZeroArrow Z x z)) (isC : isCokernel f g H) : isCokernel f g H'.
proof: Proof. assert (e : H = H') by apply hs. induction e. exact isC. Qed.
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