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Oct 10, 2011 at 13:54 vote accept Sidney Raffer
Oct 10, 2011 at 12:40 comment added Ralph I didn't check in detail, but it seems to me that your result is even true if $\mathbb{Z}$ is replaced by any PID (and, of course, $\mathbb{Q}$ by the quotient field of the PID).
Oct 10, 2011 at 12:01 comment added Qing Liu But you did the hardest part :)
Oct 10, 2011 at 10:54 history edited Qing Liu CC BY-SA 3.0
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Oct 10, 2011 at 9:56 history answered Qing Liu CC BY-SA 3.0