fact: Definition profunctor_square_to_profunctor_nat_trans {C D : category} {P Q : D ↛ C} (τ : profunctor_square (functor_identity _) (functor_identity _) P Q) : profunctor_nat_trans P Q.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.Categories.HSET.All UniMath.CategoryTheory.Categories.HSET.SetCoends UniMath.CategoryTheory.Profunctors.Core UniMath.CategoryTheory.Profunctors.Examples UniMath.CategoryTheory.Profunctors.Transformation