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If $M$ is a finitely generated $A$-module where $A$ is Noetherian and $I$ is an ideal of $A$ such that the support of $M$, $\mathrm{Supp}(M)$ is a subset of $V(I)$ the set of prime ideals containing $I$. How do i know if there exists an $n$ such that $I^n$ is a subset of $\mathrm{Ann}(M)$?

It is relevant that if $M$ is a finitely generated module then $Supp(M)=V(\text{Ann}(M))$.

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  • $\begingroup$ thank you john, i really need to start learning latex $\endgroup$
    – MichaelMoore
    Sep 19, 2015 at 20:20

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Hint. $V(J)\subset V(I)\implies \mathrm{rad}(I) \subset \mathrm{rad}(J)$, so $I \subset \mathrm{rad}(J)$. Now use that $I$ is finitely generated.

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  • $\begingroup$ what made you think about rad? $\endgroup$
    – MichaelMoore
    Sep 18, 2015 at 21:33
  • $\begingroup$ rad(I) is the intersection of all primes from V(I) $\endgroup$
    – user26857
    Sep 20, 2015 at 18:49

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