proposition: Lemma isaprop_triangle_pentagon {C : category} {tu : tensor_unit C} (ua : unitors_associator tu) : isaprop (triangle_pentagon ua).
proof: Proof. apply isapropdirprod. - apply isaprop_triangle. - apply isaprop_pentagon. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos