Proposition id_h_square_bicat_id (x : B) : id_h_square_bicat (id_v x) = id_v_square_bicat (id_h x). Proof. exact (pr1 (pr2 (pr122 B)) x). Defined.
Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat. Require Import UniMath.Bicategories.Core.Bicat. Import Bicat.Notations.