Complex Argument - GNU Scientific Library -- Reference Manual
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#### 7.11.2 Complex Argument

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

> This function computes the full complex-valued dilogarithm for the complex argument z = r \exp(i \theta). The real and imaginary parts of the result are returned in result_re, result_im.

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