proposition: Lemma is_nat_z_iso_nat_trans_id {C D : precategory} (F :functor_data C D): is_nat_z_iso (nat_trans_id F).
proof: Proof. intro c. exists (identity (F c)). split; apply id_right. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Univalence