Key points are not available for this paper at this time.
We examine the large-order behavior of perturbation theory for the anharmonic oscillator, a simple quantum-field-theory model. New analytical techniques are exhibited and used to derive formulas giving the precise rate of divergence of perturbation theory for all energy levels of the x^2N oscillator. We compute higher-order corrections to these formulas for the x^4 oscillator with and without Wick ordering.
Bender et al. (Mon,) studied this question.