∀ {ι : Type u_1} {α : Type u_2} {β : Type u_3} [inst : PartialOrder α] [inst_1 : AddCommGroup β]
  [inst_2 : PartialOrder β] [IsOrderedAddMonoid β] {f : ι → α} {g : ι → β}, Monovary f (-g) ↔ Antivary f g