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).
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.DisplayedCats.Isos.