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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Dec 28, 2009 at 7:59 vote accept Greg Kuperberg
Dec 27, 2009 at 16:34 comment added fedja The cubic case is where I got stuck too. Another related problem is that you can add the root not immediately but after several extensions (i.e., taking b to be in the extension generated by a root of the polynomial with the free term that is in the extension generated by a root of, etc.). It can happen that this iterative procedure will add the roots that cannot be added in a single extension step but I don't know how often that may happen...
Dec 27, 2009 at 16:32 history edited Greg Kuperberg CC BY-SA 2.5
added 291 characters in body
Dec 27, 2009 at 16:11 answer added Bjorn Poonen timeline score: 24
Dec 27, 2009 at 6:24 history asked Greg Kuperberg CC BY-SA 2.5