Abstract
Certain necessary and sufficient conditions for the discreteness of the spectrum of an operator are obtained in terms of its symbol and also in terms of its Wick and anti-Wick symbol.
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Translated from Matematicheskie Zametki, Vol. 11, No. 3, pp. 233–240, March, 1972.
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Shubin, M.A. On conditions that the spectra of certain operators be discrete. Mathematical Notes of the Academy of Sciences of the USSR 11, 147–151 (1972). https://doi.org/10.1007/BF01098515
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DOI: https://doi.org/10.1007/BF01098515