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Let $R$ be a ring. I find myself considering $M=R^n$, as an $R$-module. If $a$ is not a zero divisor in $R$, it holds that

$\forall x \in M: ax=0 \Rightarrow a=0 \vee x=0$ .

For what kinds of modules in general is this the case?

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    Thanks! But you're right, I'm looking specifically at the case where some elements of the ring may be zero divisors...2012-07-20

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