proposition: Lemma InitialArrowEq {C : precategory} {O : Initial C} {a : C} (f g : O --> a) : f = g.
proof: Proof. now rewrite (InitialArrowUnique f), (InitialArrowUnique g). Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Epis UniMath.CategoryTheory.Limits.Coproducts