Definition isotoid_disp {C} {D : disp_cat C} (D_cat : is_univalent_disp D) {c c' : C} (e : c = c') {d : D c} {d'} (i : z_iso_disp (idtoiso e) d d') : transportf _ e d = d'. Proof. exact (invmap (make_weq (idtoiso_disp e) (D_cat _ _ _ _ _)) i). Defined.
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.