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Our main objective in this note is to prove the following. Suppose R is a ring having an idempotent element e ( e ≠ 0, e ≠ 1) which satisfies: urn:x-wiley:01611712:media:ijmm275743:ijmm275743-math-0001 If d is any multiplicative derivation of R , then d is additive.
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M. N. Daif (1990) studied this question.
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