fact: Definition yoneda A : Functor A (A^op -> set_cat) := coyoneda A^op.
imports: Category.Core Functor.Core NaturalTransformation.Core Category.Dual Functor.Dual Functor.Composition.Core Category.Morphisms FunctorCategory.Morphisms SetCategory Functor.Attributes Functor.Composition.Functorial Functor.Identity HomFunctor FunctorCategory.Core NaturalTransformation.Paths HoTT.Tactics