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Feb 27, 2012 at 9:29 vote accept David Epstein
Feb 24, 2012 at 0:54 history edited Ben Webster CC BY-SA 3.0
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Feb 24, 2012 at 0:41 comment added Ben Webster Well, you don't need infinitely many. Just vectors that span the positive cone in the subgroup $\{\mathbf{k}\cdot (1,2,\dots,N)\equiv 0\pmod{N}$.
Feb 24, 2012 at 0:38 history edited Ben Webster CC BY-SA 3.0
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Feb 23, 2012 at 10:50 comment added David Epstein Do you mean to sum from i=1 to N in the definition of $p_h$, and the indices called h to add up to a multiple of N? This seems to give an infinite set of cyclic invariants. I was hoping that one could solve this problem with N invariants, which you say is impossible, or with not many more than N, the fewer the better.
Feb 22, 2012 at 14:10 history answered Ben Webster CC BY-SA 3.0