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S Mar 26 at 15:24 history suggested The Amplitwist CC BY-SA 4.0
fixed broken MathJax (there was an extra backslash); added link to David's comment
Mar 26 at 12:11 review Suggested edits
S Mar 26 at 15:24
Aug 23, 2010 at 21:37 history edited George Lowther CC BY-SA 2.5
simplified
Aug 18, 2010 at 19:26 comment added George Lowther f your other question is to ask if the sums $\sum_ncos(2\pi\theta n^k)/n$ and/or $\sum_nsin(2\pi\theta n^k)/n$ converge for irrational $\theta$, I think I know the answer to that one...
Aug 18, 2010 at 18:51 comment added David E Speyer OK, this works. Nice. I should probably ask another question at some point...
Aug 18, 2010 at 17:27 comment added George Lowther About Gauss sums with composite denominators: looks like they are just products of Gauss sums with prime (or prime power) denominators! I edited my answer again, and hopefully it holds together now.
Aug 18, 2010 at 17:25 history edited George Lowther CC BY-SA 2.5
added 573 characters in body
Aug 18, 2010 at 16:53 comment added George Lowther In fact, I think (3) can be fixed by requiring that there are no solutions to $x^2+1=0$ (mod b). Then you can show that $S_b$ is not fixed by the element of the Galois group taking u to 1/u. I'm going to come back to this.
Aug 18, 2010 at 16:44 comment added George Lowther I tried to fix it, but it just shifted the error to the proof of (3). I'm hopeful it can still be fixed though.
Aug 18, 2010 at 16:42 history edited George Lowther CC BY-SA 2.5
added 206 characters in body
Aug 18, 2010 at 16:35 comment added David E Speyer Interesting. I hope you can fix this. Note that, when $p$ is prime, $\sum_{k=0}^{p-1} e^{2 \pi i k^2/p}$ is a Gauss sum, and is known to have norm $\sqrt{p}$. People probably know the values of Gauss sums for composite denominators, although I don't.
Aug 18, 2010 at 16:32 history edited George Lowther CC BY-SA 2.5
fixed error in proof
Aug 18, 2010 at 16:01 history edited George Lowther CC BY-SA 2.5
fix typos; added 258 characters in body
Aug 18, 2010 at 15:50 history answered George Lowther CC BY-SA 2.5