Fermi-Dirac integral

  • #1
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Main Question or Discussion Point

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
⌽(u) du /exp.((u-uf)/kt) + 1 from 0 to ∞
expanded by tayor's series to give

⌽(u) du (from 0 to uf) +∏²/6 (kT)² [⌽'(u)] |at u=uf + 7∏⁴/360 (kT)⁴ [⌽''(u)] |at u=uf +................

where uf is such that function of u is zero for u greater than uf.
plz reply as soon as possible. thanks.
 

Answers and Replies

  • #2
vanhees71
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It's very hard to read the formulae. Please use LaTeX.
 
  • #3
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hope this could help
 

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  • #4
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plz reply. the answer on expansion by taylor series should be
 

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