∀ {ι : Type u_1} {α : Type u_2} [inst : Semiring α] [inst_1 : LinearOrder α] [IsStrictOrderedRing α] [ExistsAddOfLE α]
  {σ : Equiv.Perm ι} {f g : ι → α} [inst_4 : Fintype ι], Antivary f g → ∑ i, f i * g i ≤ ∑ i, f (σ i) * g i