Localization criterion for the spectrum of the Sturm–Liouville operator on a curve
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Kh. K. Ishkin
Translated by: A. Plotkin - St. Petersburg Math. J. 28 (2017), 37-63
- DOI: https://doi.org/10.1090/spmj/1438
- Published electronically: November 30, 2016
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Abstract:
Two spectrum localization criteria are obtained for the Sturm–Liouville operator on a piecewise smooth curve. The first of them generalizes Marchenko’s well-known criterion. The second provides a necessary and sufficient condition on the potential under which the spectrum is asymptotically localized near a ray in the sense of a regularly distributed set relative to the order $\rho =1/2$, thus confirming Fedoryuk’s conjecture about the absence, in the general case, of an asymptotic formula for the spectrum of the problem $- v”= \mu \rho (x) v$, $0<x<1$, $v(0)=v(1)=0$.References
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Bibliographic Information
- Kh. K. Ishkin
- Affiliation: Baskir State university, A. Z. Validi str. 32, 450074 Ufa, Russia
- Email: Ishkin62@mail.ru
- Received by editor(s): February 6, 2014
- Published electronically: November 30, 2016
- Additional Notes: Supported by the Ministry of Education and Science of RF (grant no. 01201456408) and by RFBR (grant no. 15-01-01095)
- © Copyright 2016 American Mathematical Society
- Journal: St. Petersburg Math. J. 28 (2017), 37-63
- MSC (2010): Primary 34B24
- DOI: https://doi.org/10.1090/spmj/1438
- MathSciNet review: 3591066