Definition nat_iso_to_trans_inv {C D : precategory} {F G : C ⟶ D} (ν : nat_iso F G) : G ⟹ F := pr1 (nat_iso_inv ν).
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.