fact: Definition ZeroArrow (Z : Zero) (a b : C) : C⟦a, b⟧ := (ZeroArrowTo Z a) · (ZeroArrowFrom Z b).
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.Limits.Initial UniMath.CategoryTheory.Limits.Terminal