fact: Definition is_univalent_disp {C} (D : disp_cat C) := ∏ x x' (e : x = x') (xx : D x) (xx' : D x'), isweq (λ ee, @idtoiso_disp _ _ _ _ e xx xx' ee).
imports: UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Isos