fact: Definition und_ob_hor_precategory (C : predoublecategory_hor) : precategory := make_precategory (und_ob_hor_precategory_data C) (und_ob_hor_precategory_axioms 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