On Sunday, February 9, 2014 12:24:56 AM UTC+4, Patrick O'Neill wrote:
>
> My problem arose when I tried to take a derivative of an expression, but 
> Sympy couldn't deduce the sign of the expression 
> log((N-1)+exp(beta*epsilon))/N) because of the problem I mentioned above.
>

What exactly you do? 

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