ABSTRACT
Let R be a prime ring with center Z, L a noncentral Lie ideal of R, and σ a nontrivial automorphism of R such that [u σ,u] n ∈ Z for all u ∈ L. If either char(R) > n or char(R) = 0, then R satisfies s 4, the standard identity in 4 variables.
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ACKNOWLEDGMENT
The author is deeply thankful to both Professor Fenwen Niu for his helpful suggestions and the referee for his careful reading of the paper.
Notes
Communicated by M. Bresar.