∀ {ι : Type u_1} {α : Type u_3} {β : Type u_2} [inst : AddCommMonoid α] [inst_1 : PartialOrder α]
  [inst_2 : AddCommMonoid β] [inst_3 : PartialOrder β] [inst_4 : SMulZeroClass α β] [inst_5 : FloorDiv α β],
  ∀ a ≤ 0, ∀ (f : ι →₀ β), Finsupp.mapRange (fun x => x ⌊/⌋ a) ⋯ f = 0