fact: Definition functor_opp_data {C D : precategory} (F : functor C D) : functor_data C^op D^op := tpair (fun F : C^op -> D^op => ∏ a b, C^op ⟦a, b⟧ -> D^op ⟦F a, F b⟧) F (fun (a b : C) (f : C⟦b, a⟧) => functor_on_morphisms F f).
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