∀ {C : Type u₂} [inst : CategoryTheory.Category.{v₂, u₂} C] {D : Type u₃} [inst_1 : CategoryTheory.Category.{v₃, u₃} D]
  {E : Type u₄} [inst_2 : CategoryTheory.Category.{v₄, u₄} E]
  (F : CategoryTheory.Functor C (CategoryTheory.Functor D E)) (X : D × C),
  F.uncurryObjFlip.inv.app X = CategoryTheory.CategoryStruct.id ((F.obj X.2).obj X.1)