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