## Series Acceleration

The functions described in this chapter accelerate the convergence of a
series using the Levin u-transform. This method takes a small number of
terms from the start of a series and uses a systematic approximation to
compute an extrapolated value and an estimate of its error. The
u-transform works for both convergent and divergent series, including
asymptotic series.

These functions are declared in the header file `gsl_sum.h`

.