proposition: Lemma lwhisker_runitor_lunitor (a : C) : identity a ◃ runitor (identity a) = identity a ◃ lunitor (identity a).
proof: Proof. apply (vcomp_lcancel (rassociator _ _ _ )). - apply is_invertible_2cell_rassociator. - rewrite runitor_triangle. rewrite lunitor_lwhisker. apply runitor_is_runitor_rwhisker. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Examples.OpMorBicat UniMath.Bicategories.Core.Examples.OpCellBicat