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这是怎么推出来的?

Posted by wywcgs at 2007-11-18 13:21:17
In Reply To:B是m!*{n-1,m-1}?{n,k}是第二类Stirling数…… Posted by:frkstyc at 2007-11-18 13:14:35
btw, 我不知道你这个对不对……

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