Abstract
We obtain a necessary and sufficient condition for the decomposition of the spectrum of an arbitrary nonsymmetric potential whose least value is attained at finitely many points.
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Ishkin, K.K. A Criterion for Spectrum Decomposition. Mathematical Notes 72, 620–630 (2002). https://doi.org/10.1023/A:1021448704093
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DOI: https://doi.org/10.1023/A:1021448704093