proposition: Lemma disp_nat_z_iso_to_trans_inv_data {α: nat_z_iso F G} (β :disp_nat_z_iso DF DG α) : disp_nat_trans_data (nat_z_iso_to_trans_inv α) DG DF.
proof: Proof. intros c d. exact (pr1 (pr2 β c d)). Defined.
imports: UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.whiskering UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Functors UniMath.CategoryTheory.DisplayedCats.Isos