Definition vcomp_whisker {a b c : C} {f g : C⟦a, b⟧} {h i : C⟦b, c⟧} (x : f ==> g) (y : h ==> i) : (x ▹ h) • (g ◃ y) = (f ◃ y) • (x ▹ i) := pr1 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 C))))))))))))) _ _ _ _ _ _ _ x y.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.PrecategoryBinProduct.