Elementary Operations
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 -- Function: int gsl_sf_multiply_impl (double x, double y, gsl_sf_result * result)
 -- Function: int gsl_sf_multiply_e (double x, double y, gsl_sf_result * result)
     Multiplication. Exceptional Return Values: GSL_EOVRFLW, GSL_EUNDRFLW

 -- Function: int gsl_sf_multiply_err_impl (double x, double dx, double y, double dy, gsl_sf_result * result)
 -- Function: int gsl_sf_multiply_err_e (double x, double dx, double y, double dy, gsl_sf_result * result)
     Multiplication of quantities with associated errors. Exceptional Return Values: GSL_EOVRFLW, GSL_EUNDRFLW