fact: Definition functor_precategory_ob_mor (C C' : precategory_data): precategory_ob_mor := make_precategory_ob_mor (functor C C') (λ F F' : functor C C', nat_trans F F').
imports: UniMath.Foundations.Propositions UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.Univalence UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence