fact: Variable (P : (C ∏ J) ⟶ D ∏ K).
imports: Category.Lib Category.Theory.Category Category.Theory.Isomorphism Category.Theory.Functor Category.Theory.Natural.Transformation Category.Functor.Bifunctor Category.Functor.Construction.Product Category.Functor.Structure.Monoidal Category.Structure.Monoidal Category.Structure.Monoidal.Product Category.Structure.Monoidal.Proofs Category.Construction.Product Category.Instance.Fun