Derivations in A Prime Γ-Ring
Received:January 03, 1990  
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Zhang Yang Inst. of Math.
Jilin University
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      In this paper, we extend Posner's theorem and the nilpotency of a derivation to a prime Γ-ring. Our main result is the following theorem; Let R be a prime Γ- ring with two derivations d, f, char R≠2. If df is a derivation too, then either d = 0 or f= 0.
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