Definition functor_from_opp_to_opp_opp (A C : precategory) (hsC : has_homsets C) : functor [A, C, hsC]^op [A^op, C^op, has_homsets_opp hsC] := tpair _ _ (is_functor_from_opp_to_opp_opp A C hsC).
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.