proposition: Lemma whisker_left_id_1mor {C : prebicategory} {b c : C} {g h : b -1-> c} (alpha : g -2-> h) : whisker_left (identity1 _) alpha = left_unitor _ ;v; alpha ;v; inv_from_z_iso (left_unitor _).
proof: Proof. unfold whisker_left. apply id_2mor_left. Defined.
imports: UniMath.Foundations.PartD UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.Categories.StandardCategories UniMath.CategoryTheory.HorizontalComposition UniMath.CategoryTheory.Equivalences.Core UniMath.Bicategories.WkCatEnrichment.prebicategory UniMath.Bicategories.WkCatEnrichment.Notations