Not likely. The accumulative sum will be positive.

來源: naive2 於 2012-07-20 10:14:55 [] [舊帖] [給我悄悄話] 閱讀數 : (127 bytes)

The accumulative sum of a 函數的一次微分 will be the integral which will be positive, if the original function 是增長的.

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