proposition: Lemma rwhisker_rwhisker_alt_CAT {A B C D : category} {F : [B, A]} {G : [C, B]} {H I : [D, C]} (α : [D, C]⟦H, I⟧) : rwhisker_CAT F (rwhisker_CAT G α) · rassociator_CAT _ _ _ = rassociator_CAT _ _ _ · rwhisker_CAT (functor_compose G F) α.
proof: Proof. apply (nat_trans_eq A); intro d. cbn. rewrite id_left; apply id_right. 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