fact: Definition precategory_binproduct_mor (C D : precategory_ob_mor) (cd cd' : C × D) := pr1 cd --> pr1 cd' × pr2 cd --> pr2 cd'.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.opp_precat