proposition: Lemma reverse_three_args_ok {C D E : category} : functor_on_objects (reverse_three_args(C:=C)(D:=D)(E:=E)) = λ c, ((pr2 c, pr2 (pr1 c)), pr1 (pr1 c)).
proof: Proof. apply idpath. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.opp_precat