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Unformatted text preview: is a prime ideal of R and P contains no zero divisors, then R is an integral domain. Let 0 6 = a , b R . We want to prove that ab 6 = 0. If a or b P , this is true because P contains no (nonzero) zero divisors. Therefore we may assume that a , b / P . But then ab / P because P is a prime ideal and the result follows. Let R be a commutative ring identity 1 6 = 0 and let M be a maximal ideal of R . Suppose M is nilpotent, that is there exists n N such that M n = 0. Prove that M is the only prime ideal of R . Let P be a prime ideal of R . If M is not contained in P , we may choose x M \ P . Then x n = 0, hence x n P and since P is prime, we deduce that x P . This is a contradiction. Therefore M P and since M is maximal and P 6 = R , we deduce that P = M and the result follows....
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 Spring '08
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 Math, Algebra

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