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Vietnam Journal of Mathematics 36:4(2008) 415-426 Prime Ideals of Group Graded Semirings and Their Smash Products  Ram Parkash Sharma and Rosy Joseph Abstract.  From an algebraic point of view, semirings provide the most natural generalization of group theory and ring theory. In the absence of additive inverses, one has to impose some weaker versions of additive inverses on semirings. This paper generalizes some ring theoretic results of M. Cohen and S. Montgomery [1] for the additively cancellative and yoked semirings.   2000 Mathematics Subject Classification: Primary 16Y60; Secondary 16Y99. Keywords: Graded prime ideals, incomparability, semirings, smash products.

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