∀ {α : Type u_1} {β : Type u_2} [inst : Preorder α] [inst_1 : Preorder β] [inst_2 : LocallyFiniteOrderTop α]
  [inst_3 : LocallyFiniteOrderTop β] [inst_4 : DecidableLE (α × β)] (a : α) (b : β),
  Finset.Ici a ×ˢ Finset.Ici b = Finset.Ici (a, b)