Rayleigh-Ritz variation method and connected-moments polynomial approach
arXiv:0807.1442 · doi:10.1002/qua.21854
Abstract
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