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Jul 21, 2016 at 18:02 vote accept Fedor Petrov
Jul 21, 2016 at 17:53 answer added Paata Ivanishvili timeline score: 5
Jul 21, 2016 at 17:42 comment added Paata Ivanishvili It is hard to believe that the Gaus-sums have nonnegative real part... Maple shows that $\sum_{k=0}^{q-1}\exp(2 \pi i \frac{p}{q} k^{2})$ has negative real part for $q=5$ and $p=2$.
Jul 21, 2016 at 17:27 history edited Fedor Petrov CC BY-SA 3.0
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Jul 21, 2016 at 15:46 history asked Fedor Petrov CC BY-SA 3.0