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Feb 28, 2016 at 15:14 vote accept JMP
Jan 27, 2016 at 7:26 history closed Pietro Majer
Stefan Kohl
Peter Humphries
Alexey Ustinov
Wolfgang
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Jan 26, 2016 at 20:23 review Close votes
Jan 27, 2016 at 7:26
Jan 7, 2016 at 9:30 review Close votes
Jan 8, 2016 at 7:01
Jan 7, 2016 at 6:25 answer added joro timeline score: 0
Jan 7, 2016 at 1:06 answer added Pietro Majer timeline score: 0
Jan 6, 2016 at 23:05 answer added David Handelman timeline score: 2
Jan 6, 2016 at 14:15 comment added JMP no all the x must be positive integers
Jan 6, 2016 at 14:12 comment added David Handelman You meant by ${\bf Z}^+$ the set of positive integers, not as I originally read it, the set of nonnegative integers. Otherwise, wlog $p \leq q$, and then set $x_1 = x_{p+1}$, $x_2 = x_{p+2}$, $\dots$, $x_p = x_{2p}$, and $x_{2p+i} = 0$ for $i \geq 1$. This would give loads of solutions.
Jan 6, 2016 at 14:10 answer added Igor Rivin timeline score: 1
Jan 6, 2016 at 13:04 history asked JMP CC BY-SA 3.0