NASA NTRS · 19740040954
Useful extremum principle for the variational calculation of matrix elements
Abstract
Variational principles are considered for the approximate evaluation of the diagonal matrix elements of an arbitrary known linear Hermitian operator. A method is derived that is immediately applicable to the variational determination of both the off-diagonal and diagonal matrix elements of normal and modified Green's functions.
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Gerjuoy, E., Rau, A. R. P., Rosenberg, L., Spruch, L.. 1974-01-01. Useful extremum principle for the variational calculation of matrix elements. https://ntrs.nasa.gov/citations/19740040954
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