∀ {α : Type u_2} {β : Type u_3} [inst : AddCommMonoid α] [inst_1 : LinearOrder α] [inst_2 : AddCommMonoid β]
  [inst_3 : PartialOrder β] [inst_4 : SMulZeroClass α β] [PosSMulReflectLE α β] [inst_6 : FloorDiv α β]
  [inst_7 : CeilDiv α β] {a : α} {b : β}, b ⌊/⌋ a ≤ b ⌈/⌉ a