fact: Definition nat_trans_data {C C' : precategory_ob_mor} (F F' : functor_data C C'): UU := ∏ x : ob C, F x --> F' x.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Univalence