proposition: Lemma isotoid_identity_iso (C : category) (H : is_univalent C) (a : C) : isotoid _ H (identity_z_iso a) = idpath _ .
proof: Proof. apply idtoiso_inj; try assumption. rewrite idtoiso_isotoid; apply idpath. Qed.
imports: UniMath.Foundations.PartA UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos