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Rayleigh-Ritz variation method and connected-moments polynomial approach

We show that the connected-moments polynomial approach proposed recently is equivalent to the well known Rayleigh-Ritz variation method in the Krylov space. We compare the latter with one of the original connected-moments methods by means of a numerical test on an anharmonic oscillator

preprint2008arXivOpen access
Francisco M. Fernandez
math-phmath.MP
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Francisco M. Fernandez

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