proposition: Lemma lwhisker_id2_CAT {C D E : category} (F : [C, D]) (G : [D, E]) : lwhisker_CAT F (id2_CAT G) = id2_CAT _.
proof: Proof. apply pre_whisker_identity. 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