Abstract
The paper considers problems with complex weight for whose spectrum the classical asymptotic formula is not true.
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References
J. D. Birkhoff, “Quantum mechanics and asymptotic series,” Bull. Amer. Math. Soc., 32, 681–700 (1933).
M. V. Fedoryuk, Asymptotic Methods for Linear Ordinary Differential Equations [in Russian], Nauka, Moscow (1983).
M. V. Fedoryuk, Asymptotics: Integrals and Series [in Russian], Nauka, Moscow (1987).
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Translated from Fundamentalnaya i Prikladnaya Matematika, Vol. 12, No. 5, pp. 49–64, 2006.
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Ishkin, K.K. On localization of the spectrum of the problem with complex weight. J Math Sci 150, 2488–2499 (2008). https://doi.org/10.1007/s10958-008-0147-4
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DOI: https://doi.org/10.1007/s10958-008-0147-4