proposition: Lemma lwhisker_hcomp {X Y Z : C} {f g : C⟦Y,Z⟧} (h : C⟦X, Y⟧) (α : f ==> g) : h ◃ α = id₂ h ⋆ α.
proof: Proof. apply pathsinv0. apply hcomp_identity_left. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Unitors