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Prony's method and the connected-moments expansion

We show that Prony's method provides the full solution to the nonlinear equations of the connected--moments expansion (CMX). Knowledge of all the parameters in the CMX ansatz is useful for the analysis of the convergence properties of the approach. Prony's method is also suitable for the calculation of the correlation function for simple quantum--mechanical models.

preprint2011arXivOpen access
Francisco M. Fernández
quant-ph
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Francisco M. Fernández

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