Transport Functions
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The transport functions are defined by the integral representations J(n,x) := \int_0^x dt t^n e^t /(e^t - 1)^2 .

 -- Function: int gsl_sf_transport_2_impl (double x, gsl_sf_result * result)
 -- Function: int gsl_sf_transport_2_e (double x, gsl_sf_result * result)
     Calculates J(2,x). Exceptional Return Values: GSL_EDOM

 -- Function: int gsl_sf_transport_3_impl (double x, gsl_sf_result * result)
 -- Function: int gsl_sf_transport_3_e (double x, gsl_sf_result * result)
     Calculates J(3,x). Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW

 -- Function: int gsl_sf_transport_4_impl (double x, gsl_sf_result * result)
 -- Function: int gsl_sf_transport_4_e (double x, gsl_sf_result * result)
     Calculates J(4,x). Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW

 -- Function: int gsl_sf_transport_5_impl (double x, gsl_sf_result * result)
 -- Function: int gsl_sf_transport_5_e (double x, gsl_sf_result * result)
     Calculates J(5,x). Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW