Eta Function

The eta function is defined by @math{\eta(s) = (1-2^{1-s}) \zeta(s)}.

Function: double gsl_sf_eta_int (int n)

Function: int gsl_sf_eta_int_e (int n, gsl_sf_result * result)

These routines compute the eta function @math{\eta(n)} for integer n.

Function: double gsl_sf_eta (double s)

Function: int gsl_sf_eta_e (double s, gsl_sf_result * result)

These routines compute the eta function @math{\eta(s)} for arbitrary s.