Definition disp_lassociator {a b c d : C} {f : C⟦a,b⟧} {g : C⟦b,c⟧} {h : C⟦c,d⟧} {w : D a} {x : D b} {y : D c} {z : D d} (ff : w -->[f] x) (gg : x -->[g] y) (hh : y -->[h] z) : ff ;; (gg ;; hh) ==>[lassociator _ _ _] (ff ;; gg) ;; hh := pr1 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 D))))))) _ _ _ _ _ _ _ w _ _ _ ff gg hh.
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.DisplayedCats.Total. Require Import UniMath.Bicategories.Core.Bicat. Import Bicat.Notations. Require Import UniMath.Bicategories.Core.Invertible_2cells. Require Import UniMath.Bicategories.Core.BicategoryLaws. Require Import UniMath.Bicategories.Core.Unitors. Require Import UniMath.Bicategories.Morphisms.Adjunctions. Require Import UniMath.Bicategories.Core.Univalence.