i am completely lost. there is an integral in my textbook in fermi dirac statistics whose result is written directly and am not able to understand . it is .(adsbygoogle = window.adsbygoogle || []).push({});

on expansion by using the method of taylor's series the result should be

where u_f is such that function of u is zero for u greater than uf.

plz reply as soon as possible. thanks.

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# I Fermi-dirac integral

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