Re: No answer, ask again for solutions - Mathematics版

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Mathematics版 - Re: No answer, ask again for solutions

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发帖数: 33

If f(x) has second order derivative
Let g(y)=log(f(exp(y)),
then g(y+b)+g(y-b)=2g(y) for any real number
Let b->0, d^2g(y)/dy^2 = g(y+b)-2g(y)+g(y-b) = 0
so g(y)=Ay+B
f(x)=Ax^B

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