proposition: Lemma vassocr_CAT {C D : category} {F G H K : [C, D]} (α : [C, D]⟦F, G⟧) (β : [C, D]⟦G, H⟧)(γ : [C, D]⟦H, K⟧) : α · (β · γ) = (α · β) · γ.
proof: Proof. apply assoc. Qed.
imports: UniMath.Foundations.PartD UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.whiskering