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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">52769</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2026-72-3-541-552</article-id><article-id pub-id-type="edn">QRKWWT</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Stability of solutions for a class of systems of nonlinear difference equations variable delay</article-title><trans-title-group xml:lang="ru"><trans-title>Устойчивость решений одного класса систем нелинейных разностных уравнений с переменным запаздыванием</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9390-2702</contrib-id><contrib-id contrib-id-type="scopus">7006445422</contrib-id><contrib-id contrib-id-type="researcherid">J-7394-2013</contrib-id><contrib-id contrib-id-type="spin">8973-3918</contrib-id><name-alternatives><name xml:lang="en"><surname>Matveeva</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Матвеева</surname><given-names>И. И.</given-names></name></name-alternatives><email>i.matveeva@g.nsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Karavaikin</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Каравайкин</surname><given-names>В. А.</given-names></name></name-alternatives><email>v.karavaikin@g.nsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Novosibirsk State University</institution></aff><aff><institution xml:lang="ru">Новосибирский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-10-13" publication-format="electronic"><day>13</day><month>10</month><year>2026</year></pub-date><volume>72</volume><issue>3</issue><issue-title xml:lang="en">On the centenary of the birth of Georgii Alexandrovich Kamenskii</issue-title><issue-title xml:lang="ru">К 100-летию со дня рождения Георгия Александровича Каменского</issue-title><fpage>541</fpage><lpage>552</lpage><history><date date-type="received" iso-8601-date="2026-10-13"><day>13</day><month>10</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Matveeva I.I., Karavaikin V.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Матвеева И.И., Каравайкин В.А.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Matveeva I.I., Karavaikin V.A.</copyright-holder><copyright-holder xml:lang="ru">Матвеева И.И., Каравайкин В.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/52769">https://journals.rudn.ru/CMFD/article/view/52769</self-uri><abstract xml:lang="en"><p>This paper examines a class of systems of nonlinear difference equations with variable delay. Conditions for the asymptotic stability of the zero solution are established, and estimates are derived for the attraction sets as well as for the rate of decay of solutions at infinity. The study uses a discrete Lyapunov--Krasovskii functional of a special form.</p></abstract><trans-abstract xml:lang="ru"><p>В работе рассматривается класс систем нелинейных разностных уравнений с переменным запаздыванием. Указаны условия асимптотической устойчивости нулевого решения, получены оценки для множеств притяжения и оценки, характеризующие скорость убывания решений на бесконечности. При исследовании используется дискретный функционал Ляпунова---Красовского специального вида.</p></trans-abstract><kwd-group xml:lang="en"><kwd>difference equations</kwd><kwd>variable delay</kwd><kwd>asymptotic stability</kwd><kwd>attraction set</kwd><kwd>estimate of solution</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>разностные уравнения</kwd><kwd>переменное запаздывание</kwd><kwd>асимптотическая устойчивость</kwd><kwd>множество притяжения</kwd><kwd>оценка решения</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Работа выполнена при поддержке Математического Центра в Академгородке, соглашение № 075-15-2025-349 с Министерством науки и высшего образования Российской Федерации.</institution></institution-wrap><institution-wrap><institution xml:lang="en">This work was supported by the Mathematical Center in Akademgorodok, Agreement No. 075-15-2025-349 with the Ministry of Science and Higher Education of the Russian Federation.</institution></institution-wrap></funding-source></award-group></funding-group></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Демиденко Г.В., Балданов Д.Ш. Об асимптотической устойчивости решений разностных уравнений с запаздыванием//Вестн. НГУ. Сер. Мат., мех., инф.-2015.-15, 4.-С. 50-62.-DOI: 10.17377/PAM.2015.15.406.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Демиденко Г.В., Матвеева И.И. Асимптотические свойства решений дифференциальных уравнений с запаздывающим аргументом//Вестн. НГУ. Сер. Мат., мех., инф.-2005.-5, 3.-С. 20-28.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Куликов А.Ю., Малыгина В.В. Устойчивость линейного разностного уравнения и оценки его фундаментального решения//Изв. вузов. Сер. Мат.-2011.-12.-С. 30-41.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Малыгина В.В., Чудинов К.М. Асимптотика решений разностных уравнений с запаздываниями//Изв. вузов. Сер. Мат.-2016.-7.-С. 66-82.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Матвеева И.И., Хмиль А.В. Устойчивость решений одного класса нелинейных систем разностных уравнений с запаздыванием//Мат. заметки СВФУ.-2021.-28, 3.-С. 31-44.-DOI: 10.25587/SVFU.2021.56.29.003.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Хусаинов Д.Я., Шатырко А.В. Исследование абсолютной устойчивости разностных системы с запаздыванием вторым методом Ляпунова//Журн. выч. прикл. мат.-2010.-4, 103.-С. 118-126.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Agarwal R.P., Kim Y.H., Sen S.K. Advanced discrete Halanay-type inequalities: stability of difference equations//J. Inequal. Appl.-2009.-2009.-535849.-DOI: 10.1155/2009/535849.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Batinec J., Demchenko H., Diblik J., Khusainov D.Ya. Exponential stability of linear discrete systems with multiple delays//Discrete Dyn. Nat. Soc.-2018.-2018.-9703919.-DOI: 10.1155/2018/9703919.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Berezansky L., Braverman E. Exponential stability of difference equations with several delays: recursive approach//Adv. Differ. Equ.-2009.-2009.-104310.-DOI: 10.1155/2009/104310.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Diblik J. Exponential stability of linear discrete systems with multiple delays by degenerated Lyapunov-Krasovskii functionals//Appl. Math. Lett.-2023.-142.-108654.-DOI: 10.1016/j.aml.2023.108654.</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>Erbe L.H., Xia H., Yu J.S. Global stability of a linear nonautonomous delay difference equation//J. Differ. Equ. Appl.-1995.-1.-С. 151-161.-DOI: 10.1080/10236199508808016.</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Gyori I., Hartung F. Stability in delayed perturbed differential and difference equations//Fields Inst. Commun.-2001.-29.-С. 181-194.-DOI: 10.1090/fic/029/14.</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Gyori I., Pituk M. Asymptotic formulae for the solutions of a linear delay difference equation//J. Math. Anal. Appl.-1995.-136.-С. 376-392.</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>Ngoc P.H.A., Trinh H., Hieu L.T., Huy N.D. On contraction of nonlinear difference equations with time-varying delays//Math. Nachr.-2019.-292,. 4.-С. 859-870.-DOI: 10.1002/mana.201700167.</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Park J.H., Lee T.H., Liu Y., Chen J. Dynamic systems with time delays: stability and control.-Singapore: Springer, 2019.-DOI: 10.1007/978-981-13-9254-2.</mixed-citation></ref><ref id="B16"><label>16.</label><mixed-citation>Stojanovic S.B., Debeljkovic D.L.J., Dimitrijevic N. Stability of discrete-time systems with time-varying delay: delay decomposition approach//Int. J. Computers Commun. Control.-2012.-7, 4.-С. 775-783.-DOI: 10.15837/ijccc.2012.4.1375.</mixed-citation></ref><ref id="B17"><label>17.</label><mixed-citation>Yu J.S. Asymptotic stability of a linear difference equation with variable delay//Comp. Math. Appl.-1998.-36, 10-12.-С. 203-210.-DOI: 10.1016/S0898-1221(98)80021-7.</mixed-citation></ref></ref-list></back></article>
