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Approach to energy eigenvalues and eigenfunctions from nonperturbative regions of eigenfunctions
Physical Review E, 2001We study the approach to energy eigenvalues and eigenfunctions of Hamiltonian matrices with band structure from diagonalization of their truncated matrices. Making use of a generalization of Brillouin-Wigner perturbation theory, it is shown that in order to obtain approximate energy eigenvalues and eigenfunctions the sizes of truncated matrices should ...
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On Expansions in Eigenfunctions
Journal of the London Mathematical Society, 1939openaire +2 more sources
An Expansion in Eigenfunctions
Proceedings of the London Mathematical Society, 1951openaire +2 more sources
An Expansion in Eigenfunctions
Journal of the London Mathematical Society, 1946openaire +2 more sources
On the zeros of eigenfunctions
Functional Analysis and Its Applications, 1973openaire +2 more sources