Definition is_precat_opp_precat_data (C : precategory) : is_precategory (opp_precat_data C) := ((λ a b, pr212 C b a),,(λ a b, pr112 C b a)),, ((λ a b c d f g h, pr222 C d c b a h g f),,(λ a b c d f g h, pr122 C d c b a h g f)).
Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.Setcategories. Require Import UniMath.CategoryTheory.FunctorCategory.