Function rgsl::fermi_dirac::complete_integrals::fermi_dirac_int

pub fn fermi_dirac_int(j: i32, x: f64) -> f64

This routine computes the complete Fermi-Dirac integral with an integer index of j, F_j(x) = (1/\Gamma(j+1)) \int_0^\infty dt (t^j /(\exp(t-x)+1)).