proposition: Lemma rinvunitor_runitor_CAT {C D : category} (F : [C, D]) : rinvunitor_CAT F · runitor_CAT _ = id2_CAT _.
proof: Proof. apply (nat_trans_eq D); intro c. 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