fact: Definition unitors_associator {C : category} (tu : tensor_unit C) : UU := lunitor tu × runitor tu × associator tu.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos