fact: Definition runitor_invertible {C : category} {tu : tensor_unit C} (ua : unitors_associator tu) : UU := ∏ (x : C), is_z_isomorphism (pr1 ru^{ua} x).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos