∀ {R : Type u} [inst : CommSemiring R] {ι : Type u_2} (s : Finset ι) (f : ι → Polynomial R) (I : Ideal R) (n : ι → ℕ),
  (∀ i ∈ s, ∀ (k : ℕ), (f i).coeff k ∈ I ^ (n i - k)) → ∀ (k : ℕ), (s.prod f).coeff k ∈ I ^ (s.sum n - k)