fact: Definition oppositeCategory : category -> category := λ M, @tpair precategory has_homsets (opp_precat M) (λ A B, homset_property M (rm_opp_ob B) (rm_opp_ob A)).
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