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Answer to Question #22736 in Abstract Algebra for Irvin

Question #22736
Let R be a commutative domain and S^(−1)R be the localization of R at a multiplicative set S.
Is "rad S−1R ⊆ S−1(rad R)" ?
Expert's answer
If we take R = Z and S=Z2Z. Here,rad S−1R =2Z(2) and R ∩ rad S−1R =2Z, but radR =0.So, this inclusion in not true ingeneral.

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