fact: Definition inverse : Functor ((D -> C1) * (D -> C2)) (D -> C1 * C2) := Functor.Prod.Functorial.functor _ _ _.
imports: Category.Core Functor.Core FunctorCategory.Core Category.Prod Functor.Prod Functor.Composition.Core NaturalTransformation.Composition.Laws NaturalTransformation.Composition.Core Types.Prod