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Sep 10, 2021 at 23:05 comment added KConrad Concerning the last paragraph, methods related to integral extensions are a bit beyond the usual syllabus of a first number theory course for undergraduates. That's why proving $2/p$ is not in $\mathbf Z[\zeta_p]$ is a bit tedious for such a course.
Jun 27, 2012 at 0:19 history edited David Benjamin Lim CC BY-SA 3.0
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Jun 12, 2012 at 14:49 history edited David Benjamin Lim CC BY-SA 3.0
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Jun 12, 2012 at 14:19 history edited David Benjamin Lim CC BY-SA 3.0
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Jun 12, 2012 at 12:56 history answered David Benjamin Lim CC BY-SA 3.0