fact: Definition is_double_univalent (C : doublecategory) := (is_univalent (und_ob_hor_cat C) × is_univalent_twosided_disp_cat (doublecategory_to_twosided_disp_cat 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