Definition isaprop_is_nat_z_iso {C D : category} {F G : C ⟶ D} (α : nat_trans_data F G) : isaprop (is_nat_z_iso α). Proof. apply impred. intro. apply isaprop_is_z_isomorphism. Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.TransportMorphisms. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.Univalence.