Proposition transportb_disp_mor2_idpath {D : twosided_disp_cat} {x₁ x₂ : C₁} {y₁ y₂ : C₂} {xy₁ : D x₁ y₁} {xy₂ : D x₂ y₂} {f : x₁ --> x₂} (p : f = f) {g : y₁ --> y₂} (q : g = g) (fg : xy₁ -->[ f ][ g ] xy₂) : transportb_disp_mor2 p q fg = fg. Proof. apply transportf_disp_mor2_idpath. Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.PrecategoryBinProduct.