Definition nat_trans_functor_assoc_inv (F1 : functor A B) (F2 : functor B C) (F3 : functor C D) : nat_trans (functor_composite F1 (functor_composite F2 F3)) (functor_composite (functor_composite F1 F2) F3) := nat_trans_functor_assoc F1 F2 F3.
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.