Definition is_iso_twosided_disp_struct_cospan_sqr : is_iso_twosided_disp (identity_is_z_iso _) (identity_is_z_iso _) sq. Proof. simple refine (_ ,, _ ,, _). - exact is_iso_twosided_disp_struct_cospan_sqr_inv. - abstract (use struct_cospan_sqr_eq ; rewrite transportb_disp_mor2_struct_cospan ; cbn ; exact (z_iso_inv_after_z_iso i)). - abstract (use struct_cospan_sqr_eq ; rewrite transportb_disp_mor2_struct_cospan ; cbn ; exact (z_iso_after_z_iso_inv i)). Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.CategoryTheory.Core.Setcategories. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.DisplayedCats.Constructions. Require Import UniMath.CategoryTheory.DisplayedCats.Isos. Require Import UniMath.CategoryTheory.DisplayedCats.Univalence. Require Import UniMath.CategoryTheory.Limits.Pushouts. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.DisplayedFunctor. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Total. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Strictness. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Examples.Constant. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.Examples.DispCatOnTwoSidedDispCat.