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May 9, 2017 at 21:22 comment added Peter Mueller I believe that the point of the question is whether there are cases where the critical points can not be computed by a quartic formula.
May 9, 2017 at 21:01 history edited Robert Israel CC BY-SA 3.0
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May 9, 2017 at 20:48 history answered Robert Israel CC BY-SA 3.0