科研之友
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摘要
Let R be a prime ring with extended centroid C, a nonzero ideal I and two derivations d(1), d(2). Suppose that d(1)(x)(n) = d(2)(x)(n) for all x is an element of I. Then there exists lambda is an element of C such that d(2)(x) = lambda d(1)(x) for all x is an element of R.
