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Jul 24, 2013 at 23:13 comment added Sergei Ivanov Yes the sign was wrong, but it does not matter for the argument.
Jul 24, 2013 at 14:57 comment added mathlove @Sergei Ivanov: Many thanks! $$x_{i+1}=-x_{i-1}-(\frac{n}{\lambda}-2)x_i$$ isn't it?
Jul 22, 2013 at 14:38 vote accept mathlove
Jul 21, 2013 at 6:17 history edited Ricardo Andrade CC BY-SA 3.0
corrected typo
Jul 21, 2013 at 0:10 comment added Joseph O'Rourke Wow! Beautiful argument!
Jul 20, 2013 at 22:06 history answered Sergei Ivanov CC BY-SA 3.0