Let the second derivative of F (x) be always greater than 0 and f (x) be constant in the domain R

F'(x)=(f'(x)x-f(x))/x^2
Just prove that the molecule is positive
We can use Taylor expansion f (0) = f (x) - f '(x) x + 1 / 2F' '(T) x ^ 2 to bring in the condition

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