Abstract: | Abstract Let R be a prime ring of characteristic different from 2, d a non-zero derivation of R, I a non-zero right ideal of R, a ∈ R, S 4(x 1,…, x 4) the standard polynomial in 4 variables. Suppose that, for any x, y ∈ I, ad(x, y]), x, y]] = 0. If S 4(I, I, I, I)I ≠ 0, then aI = ad(I) = 0. |