fact: Definition opp_precat_ob_mor (C : precategory_ob_mor) : precategory_ob_mor := tpair (λ ob : UU, ob -> ob -> UU) C (λ a b : C, C⟦b, 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