@cindex Transport functionsThe transport functions @math{J(n,x)} are defined by the integral representations@c{$J(n,x) := \int_0^x dt \, t^n e^t /(e^t - 1)^2$}@math{J(n,x) := \int_0^x dt t^n e^t /(e^t - 1)^2}.They are declared in the header file @file{gsl_sf_transport.h}.@deftypefun double gsl_sf_transport_2 (double @var{x})@deftypefunx int gsl_sf_transport_2_e (double @var{x}, gsl_sf_result * @var{result})These routines compute the transport function @math{J(2,x)}.@comment Exceptional Return Values: GSL_EDOM@end deftypefun@deftypefun double gsl_sf_transport_3 (double @var{x})@deftypefunx int gsl_sf_transport_3_e (double @var{x}, gsl_sf_result * @var{result})These routines compute the transport function @math{J(3,x)}.@comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW@end deftypefun@deftypefun double gsl_sf_transport_4 (double @var{x})@deftypefunx int gsl_sf_transport_4_e (double @var{x}, gsl_sf_result * @var{result})These routines compute the transport function @math{J(4,x)}.@comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW@end deftypefun@deftypefun double gsl_sf_transport_5 (double @var{x})@deftypefunx int gsl_sf_transport_5_e (double @var{x}, gsl_sf_result * @var{result})These routines compute the transport function @math{J(5,x)}.@comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW@end deftypefun