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Coincident anharmonic oscillators
Physical Review D, 1981J. Avron, R. Seiler
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The Anharmonic Oscillator Revisited
1988The quartic anharmonic oscillator with the Hamiltonian $${\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{H}} = \tfrac{1}{2}{{{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{p}}}^{2}} + \tfrac{1}{2}{{{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{q}}}^{2}} + \tfrac{\lambda }{4}{{{\underset{\raise0.3em\hbox ...
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