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Apr 14, 2010 at 14:08 comment added Ben Webster Ack! My brain was clearly not having a good night!
Apr 14, 2010 at 14:08 history edited Ben Webster CC BY-SA 2.5
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Apr 14, 2010 at 10:54 comment added David E Speyer My comment was to a previous version of Ben's answer.
Apr 14, 2010 at 4:13 comment added Craig Westerland This is not the Conrad you are looking for.
Apr 14, 2010 at 4:08 history undeleted Ben Webster
Apr 14, 2010 at 4:08 history edited Ben Webster CC BY-SA 2.5
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Apr 13, 2010 at 22:33 history deleted Ben Webster
Apr 13, 2010 at 22:28 comment added David E Speyer In the previous comment, "is a subring of O_K" should read "is a full rank subring of O_K".
Apr 13, 2010 at 22:25 comment added David E Speyer This is a bit subtle. The definition of unramified is that there are no repeated prime ideals in the factorization of (p). If the ring of integers of K is of the form Z[a]/f(a), then this is equivalent to saying that f(x) has no repeated factors mod p. If Z[a]/f(a) is a subring of O_K, then f(x) having no repeated factors mod p implies that p is unrammified, but not vice versa. Fortunately, the direction Adam needs is the true one.
Apr 13, 2010 at 22:09 history edited Ben Webster CC BY-SA 2.5
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Apr 13, 2010 at 21:59 history answered Ben Webster CC BY-SA 2.5