fact: Definition associator_data {C : category} (T : tensor_data C) : UU := ∏ (x y z : C), C ⟦(x ⊗_{T} y) ⊗_{T} z, x ⊗_{T} (y ⊗_{T} z)⟧.
imports: UniMath.Foundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos