{"title":"Spectral Properties of the Fourth Order Differential Operator with Integral Conditions","authors":"R. D. Karamyan, A. L. Skubachevskii","doi":"10.1134/s1995080224601188","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We consider an ordinary fourth-order differential equation with a spectral parameter and integral conditions containing a linear combination of derivatives of an unknown function. In terms of equivalent norms, a priori estimates for solutions of this problem are obtained for sufficiently large values of the spectral parameter. Using these estimates, the discreteness, the sectorial structure of spectrum, and the Fredholm solvability of problem are proven.</p>","PeriodicalId":46135,"journal":{"name":"Lobachevskii Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Lobachevskii Journal of Mathematics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s1995080224601188","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
We consider an ordinary fourth-order differential equation with a spectral parameter and integral conditions containing a linear combination of derivatives of an unknown function. In terms of equivalent norms, a priori estimates for solutions of this problem are obtained for sufficiently large values of the spectral parameter. Using these estimates, the discreteness, the sectorial structure of spectrum, and the Fredholm solvability of problem are proven.
期刊介绍：
Lobachevskii Journal of Mathematics is an international peer reviewed journal published in collaboration with the Russian Academy of Sciences and Kazan Federal University. The journal covers mathematical topics associated with the name of famous Russian mathematician Nikolai Lobachevsky (Lobachevskii). The journal publishes research articles on geometry and topology, algebra, complex analysis, functional analysis, differential equations and mathematical physics, probability theory and stochastic processes, computational mathematics, mathematical modeling, numerical methods and program complexes, computer science, optimal control, and theory of algorithms as well as applied mathematics. The journal welcomes manuscripts from all countries in the English language.
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