∀ {α : Type u_2} {β : Type u_1} [inst : Preorder α] [inst_1 : Preorder β] {l : αᵒᵈ → βᵒᵈ} {u : βᵒᵈ → αᵒᵈ}
  (x : GaloisInsertion l u),
  GaloisConnection (⇑OrderDual.toDual ∘ u ∘ ⇑OrderDual.ofDual) (⇑OrderDual.toDual ∘ l ∘ ⇑OrderDual.ofDual)