Definition square_double_bicat {B : ver_bicat_sq_bicat} {w x y z : B} (h₁ : w --> x) (h₂ : y --> z) (v₁ : w -|-> y) (v₂ : x -|-> z) : UU := v₁ -->[ h₁ ][ h₂ ] v₂.
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.