(C : Type u₁) →
  [inst : CategoryTheory.Category.{v₁, u₁} C] →
    (D : Type u₂) →
      [inst_1 : CategoryTheory.Category.{v₂, u₂} D] → (CategoryTheory.Functor Cᵒᵖ D)ᵒᵖ ≌ CategoryTheory.Functor C Dᵒᵖ