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Journal of the Belarusian State University. Mathematics and Informatics, 2019, Volume 1, Pages 28–32
DOI: https://doi.org/10.33581/2520-6508-2019-1-28-32
(Mi bgumi71)
 

This article is cited in 8 scientific papers (total in 8 papers)

Differential equations and Optimal control

On spectra of upper Sergeev frequencies of linear differential equations

A. S. Vaidzelevich

Institute of Mathematics, National Academy of Sciences of Belarus, 11 Surhanava Street, Minsk 220072, Belarus
Full-text PDF (380 kB) Citations (8)
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Abstract: It is known that the spectra (ranges) of upper and lower Sergeev frequencies of zeros, signs, and roots of a linear differential equation of order greater than two with continuous coefficients belong to the class of Suslin sets on the nonnegative half-line of the extended real line. Moreover, for the spectra of upper frequencies of third-order equations this result was inverted under the assumption that the spectra contain zero. In the present paper we obtain an inversion of the above statement for equations of the fourth order and higher. Namely, for an arbitrary zero-containing Suslin subset S on the nonnegative half-line of the extended real line and a positive integer number n greater than three a n order linear differential equation is constructed, which spectra of the upper Sergeev frequencies of zeros, signs, and roots coincide with the set S.
Keywords: linear differential equation; spectrum of the upper Sergeev frequencies of zeros; spectrum of the upper Sergeev frequencies of signs; spectrum of the upper Sergeev frequencies of roots; Suslin set.
Funding agency Grant number
Belarusian Republican Foundation for Fundamental Research Ф17-102
The work was performed with financial support from the Belarusian Republican Foundation for Fundamental Research (agreement No. Ф17-102).
Document Type: Article
UDC: 517.926.4
Language: Russian
Citation: A. S. Vaidzelevich, “On spectra of upper Sergeev frequencies of linear differential equations”, Journal of the Belarusian State University. Mathematics and Informatics, 1 (2019), 28–32
Citation in format AMSBIB
\Bibitem{Vai19}
\by A.~S.~Vaidzelevich
\paper On spectra of upper Sergeev frequencies of linear differential equations
\jour Journal of the Belarusian State University. Mathematics and Informatics
\yr 2019
\vol 1
\pages 28--32
\mathnet{http://mi.mathnet.ru/bgumi71}
\crossref{https://doi.org/10.33581/2520-6508-2019-1-28-32}
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  • This publication is cited in the following 8 articles:
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