proposition: Lemma lunitor_is_lunitor_lwhisker (a : C) : lunitor (identity a · identity a) = identity a ◃ lunitor (identity a).
proof: Proof. apply (vcomp_rcancel (lunitor _ )). - apply is_invertible_2cell_lunitor. - apply pathsinv0. apply vcomp_lunitor . 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