摘要
Let di(1≤ i≤n), 51,52, 53 be nonzero derivations of a prime ring R with char R ≠ 2. Suppose that U is a Lie ideal such that u2 ∈ U for all u ∈ U. In this paper, we prove that U [U→] Z(R) when one of the following holds: (1) d1(x1)d2(x2),… ,dn(xn)∈Z(R) (2) δ3(y)δ1(x) = δ2(x)δ3(y). Further, if g is a Lie ideal and a subring then (3) δ1(x)δ2(y) +δ2(x)δ1(y) ∈ Z(R) for all xi,x,y ∈ U.
基金
Supported by the Natural Science Research Item of Anhui Province College(KJ2008B013)