12/3/2008: We have decided to give away the 10 points in Problem 5.2(2). The statement holds for Delta >= 2, but is hard to prove.
That is, everyone would get 10 free points, and those who can solve it (for Delta >= 2) would get 10 bonus points. Sorry for the inconveniences
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Last updated at CST 19:48, December 27, 2008 Please feel free to contact me:
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