fact: Definition leftunitor_is_natiso {C : category} {T : tensor_data C} {I : C} (lu : leftunitor_data T I) : UU := ∏ (x : C), is_z_isomorphism (lu x).
imports: UniMath.Foundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos