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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">matmess</journal-id><journal-title-group><journal-title xml:lang="ru">Математические заметки СВФУ</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematical notes of NEFU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2411-9326</issn><issn pub-type="epub">2587-876X</issn><publisher><publisher-name>Северо-Восточный федеральный университет имени М.К. Аммосова</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25587/2411-9326-2025-4-3-13</article-id><article-id custom-type="elpub" pub-id-type="custom">matmess-120</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>Устойчивость решений функционально-разностных уравнений</article-title><trans-title-group xml:lang="en"><trans-title>Stability of solutions to systems  of functional-diﬀerence equations</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Белобородова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Beloborodova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Белобородова Алина Викторовна</p><p>ул. Пирогова, 1, Новосибирск 630090</p></bio><bio xml:lang="en"><p>Alina V. Beloborodova</p><p>1 Pirogov Street, Novosibirsk 630090</p></bio><email xlink:type="simple">a.beloborodova1@g.nsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Искаков</surname><given-names>Т. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Iskakov</surname><given-names>T. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Искаков Тимур Кайратович</p><p>пр. Академика Коптюга, 4, Новосибирск 630090</p></bio><bio xml:lang="en"><p>Timur K. Iskakov</p><p>4 Koptyug Avenue, Novosibirsk 630090</p></bio><email xlink:type="simple">istima92@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Новосибирский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт математики им. С. Л. Соболева СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sobolev Institute of Mathematics</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>30</day><month>12</month><year>2025</year></pub-date><volume>32</volume><issue>4</issue><fpage>3</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Белобородова А.В., Искаков Т.К., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Белобородова А.В., Искаков Т.К.</copyright-holder><copyright-holder xml:lang="en">Beloborodova A.V., Iskakov T.K.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://matmess.elpub.ru/jour/article/view/120">https://matmess.elpub.ru/jour/article/view/120</self-uri><abstract><p>Рассматривается класс систем нелинейных функционально-разностных уравнений с периодическими коэффициентами в линейной части. С использованием функции Ляпунова установлены достаточные условия экcпоненциальной устойчивости нулевого решения, получены оценки, характеризующие скорость убывания решений на бесконечности, и оценки множества притяжения.</p></abstract><trans-abstract xml:lang="en"><p>We consider a class of systems of nonlinear functional-diﬀerence equations with periodic coeﬃcients in the linear part. Using the Lyapunov function, we establish suﬃcient conditions for the exponential stability of the zero solution and estimates characterizing the rate of decay of solutions at inﬁnity.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>функционально-разностные уравнения</kwd><kwd>периодические коэффициенты</kwd><kwd>экспоненциальная устойчивость</kwd><kwd>оценки решений</kwd><kwd>функция Ляпунова</kwd></kwd-group><kwd-group xml:lang="en"><kwd>functional-difference equations</kwd><kwd>periodic coefficients</kwd><kwd>exponential stability</kwd><kwd>solution estimates</kwd><kwd>Lyapunov function</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Института математики им. С. Л. Соболева СО РАН (проект № FWNF–2022–0008).</funding-statement><funding-statement xml:lang="en">The study was carried out within the framework of the state contract of the Sobolev Institute of Mathematics (project No. FWNF–2022–0008).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Hahn W. Theorie und Anwendung der Direkten Methode von Ljapunov. Berlin; G¨ottingen; Heidelberg: Springer, 1959.</mixed-citation><mixed-citation xml:lang="en">Hahn W., Theorie und Anwendung der Direkten Methode von Ljapunov, Springer, Berlin; Gottingen; Heidelberg (1959).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Halanay A., Wexler D. Qualitative theory of impulse systems. Bucharest: Rom. Acad. 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