回复:Problem 6
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dynamic
于
2009-07-27 18:18:33
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Choosing a1, a2, …, a(n) such that a1+a2+…a(n) is not equal to b(n-1) is not enough to apply the induction. If b(n) < a1+a2+...+an, then you have n numbers in M and for the induction to work you can only have n - 1.