Rayleigh  Schrödinger perturbation series
for quartic anharmonic oscillator
x^{2}/2 + g x^{4}
H = H_{0} + g x^{4} 
Hamiltonian of the problem 
E(g) = E_{0} + E_{1} g + ...
+ E_{N} g^{N} 
Perturbation expansion of energy 
H_{0} = p^{2}/2 + x^{2}/2 
Hamiltonian of harmonic oscillator 
E_{0} = n + 1/2 
Unperturbed harmonicoscillator energy 
g 
Small perturbation parameter 
n 
Harmonic oscillator quantum number 
N 
Order of perturbation theory 

Mathematica
program for this calculation
600
coefficients of the expansion for n=0,
n=1, and
n=2 calculated earlier
1000
coefficients of the expansion for n=0,
n=1, and
n=2, gzipformat
Online
calculation of Rayleigh  Schrödinger perturbation series
Online
calculations
Designed by A. Sergeev