In this paper, it is first given as a necessary and sufficient condition that infinite matrices of a certain type have double eigenvalues. The computation of such double eigenvalues is enabled by the ...
The following von Neumann-Wigner type result is proved: The set of potentials $a: \Gamma \rightarrow \mathbf{R} (\Gamma \subseteq \mathbf{Z}^N)$, with the property ...
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