Abstract
A new approach to non-relativistic large order perturbation theory for constructing energy and wave function correction up to K th order has been developed. Convergent argument of this series has been demonstrated for the ground state of second order and fourth order Schroedinger equation. Further a comparison with the Bender and Wu computational work reflects that the present series is not the same as Rayleigh-Schroedinger perturbation series.
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