fact: Definition associator_naturality {C : category} {T : tensor_data C} (α : associator_data T) : UU := ∏ (x x' y y' z z' : C), ∏ (f : C⟦x,x'⟧) (g : C⟦y,y'⟧) (h : C⟦z,z'⟧), (f ⊗^{T} (g ⊗^{T} h))∘(α x y z) = (α x' y' z')∘ ((f ⊗^{T} g) ⊗^{T} h).
imports: UniMath.Foundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos