fact: Definition und_ob_hor_ob_mor (C : predoublecategory_ob_mor_hor) : precategory_ob_mor := make_precategory_ob_mor (pr1 C) (pr2 C).
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence