proposition: Lemma postcomp_with_ZeroArrow (Z : Zero) (a b c : C) (f : C⟦b, c⟧) : ZeroArrow Z a b · f = ZeroArrow Z a c.
proof: Proof. unfold ZeroArrow at 1. rewrite <- assoc. apply ZeroArrowUnique. Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.CategoryTheory.Limits.Graphs.Limits UniMath.CategoryTheory.Limits.Graphs.Initial UniMath.CategoryTheory.Limits.Graphs.Terminal UniMath.CategoryTheory.Limits.Zero