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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Jan 4, 2010 at 17:04 comment added Pete L. Clark Thanks, David. I will return the favor by recommending your expository post -- these are just the sort of questions that should be discussed in basic courses on algebra and number theory (but too rarely are).
Jan 4, 2010 at 16:23 history answered David E Speyer CC BY-SA 2.5