proposition: Lemma isInitial_Initial (I : Initial) : isInitial (InitialObject I).
proof: Proof. use make_isInitial. intros b. use tpair. - exact (InitialArrow I b). - intros t. use (InitialArrowUnique I). Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.CategoryTheory.Limits.Graphs.EqDiag UniMath.CategoryTheory.Limits.Initial