proposition: Lemma is_invertible_2cell_lassociator {a b c d : C} (f : C⟦a,b⟧) (g : C⟦b,c⟧) (h : C⟦c,d⟧) : is_invertible_2cell (lassociator f g h).
proof: Proof. exists (rassociator f g h). split; [ apply lassociator_rassociator | apply rassociator_lassociator ]. Defined.
imports: UniMath.Tactics.EnsureStructuredProofs UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.PrecategoryBinProduct