fact: Definition runitor_nat {C : category} {tu : tensor_unit C} (ru : runitor_data tu) : UU := ∏ (x y : C) (f : C⟦x,y⟧), (f ⊗^{tu} (identity I_{tu})) · (ru y) = (ru x) · f.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos