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# functions in fermi.i - i

 ifd12 ``` ifd12(y) return x = inverse of Fermi-Dirac integral of order 1/2, y = integral[0 to inf]{ dt * t^0.5 / (exp(t-x)+1) } accurate to about 1e-8 interpreted function, defined at i/fermi.i line 208 ``` SEE ALSO: ifdm12,   ifd32,   ifd52,   fdm12,   fd12,   fd32,   fd52

 ifd32 ``` ifd32(y) return x = inverse of Fermi-Dirac integral of order 3/2, y = integral[0 to inf]{ dt * t^1.5 / (exp(t-x)+1) } accurate to about 1e-8 interpreted function, defined at i/fermi.i line 239 ``` SEE ALSO: ifdm12,   ifd12,   ifd52,   fdm12,   fd12,   fd32,   fd52

 ifd52 ``` ifd52(y) return x = inverse of Fermi-Dirac integral of order 5/2, y = integral[0 to inf]{ dt * t^2.5 / (exp(t-x)+1) } accurate to about 1e-8 interpreted function, defined at i/fermi.i line 271 ``` SEE ALSO: ifdm12,   ifd12,   ifd32,   fdm12,   fd12,   fd32,   fd52

 ifdm12 ``` ifdm12(y) return x = inverse of Fermi-Dirac integral of order -1/2, y = integral[0 to inf]{ dt * t^-0.5 / (exp(t-x)+1) } accurate to about 1e-8 interpreted function, defined at i/fermi.i line 173 ``` SEE ALSO: ifd12,   ifd32,   ifd52,   fdm12,   fd12,   fd32,   fd52