Dilogarithm
===========

Real Argument
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In Lewin's notation this is  Li_2(x) , the real part of the dilogarithm of a real x. It is defined by the integral representation Li_2(x) = - Re \int_0^x ds \log(1-s) / s . Note that Im Li_2(x) = ( 0 for x <= 1, -Pi*log(x) for x > 1 ) .

 -- Function: int gsl_sf_dilog_impl (double x, gsl_sf_result * result)
 -- Function: int gsl_sf_dilog_e (double x, gsl_sf_result * result)

Complex Argument
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This is the full complex-valued dilogarithm for complex argument. The argument is  z = r \exp(i theta) .

 -- Function: int gsl_sf_complex_dilog_impl (double r, double theta, gsl_sf_result * result_re, gsl_sf_result * result_im)
 -- Function: int gsl_sf_complex_dilog_e (double r, double theta, gsl_sf_result * result_re, gsl_sf_result * result_im)