fact: Definition tensor_data (C : category) : UU := ∑ T : C -> C -> C, ∏ (x1 x2 y1 y2 : C), C⟦x1,x2⟧ -> C⟦y1,y2⟧ -> C⟦T x1 y1, T x2 y2⟧.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos