proposition: Lemma functor_opp_composite {C D E : precategory} (F : functor C D) (G : functor D E) (hsE : has_homsets E) : functor_opp (functor_composite F G) = functor_composite (functor_opp F) (functor_opp G).
proof: Proof. apply (functor_eq _ _ (has_homsets_opp hsE)); trivial. Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.FunctorCategory