Definition nat_trans_fix_snd_arg: functor_fix_snd_arg C D E F d ⟹ functor_fix_snd_arg C D E F' d := tpair _ nat_trans_fix_snd_arg_data nat_trans_fix_snd_arg_ax.
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.Univalence. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.FunctorCategory. Require Import UniMath.CategoryTheory.opp_precat.