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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">News of the Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">News of the Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Кабардино-Балкарского научного центра РАН</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1991-6639</issn><issn publication-format="electronic">2949-1940</issn></journal-meta><article-meta><article-id pub-id-type="publisher-id">265574</article-id><article-id pub-id-type="doi">10.35330/1991-6639-2024-26-4-130-144</article-id><article-id pub-id-type="edn">XBPQQS</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>Математика и механика</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">Boundary value problem for a differential-difference equation with a fractional derivative</article-title><trans-title-group xml:lang="ru"><trans-title>Краевая задача для дифференциально-разностного уравнения с дробной производной</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0007-9406-8119</contrib-id><name-alternatives><name xml:lang="ru"><surname>Видзижева</surname><given-names>Лейла Магомедовна</given-names></name><name xml:lang="en"><surname>Vidzizheva</surname><given-names>Leila M.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>аспирант</p></bio><bio xml:lang="en"><p>Postgraduate Student</p></bio><email>danocha_999@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="spin">6070-1196</contrib-id><name-alternatives><name xml:lang="en"><surname>Kanametova</surname><given-names>Dana A.</given-names></name><name xml:lang="ru"><surname>Канаметова</surname><given-names>Дана Асланбиевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Economic Sciences, Researcher</p></bio><bio xml:lang="ru"><p>к.э.н., науч. сотр.</p></bio><email>danocha_999@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="ru">Научно-образовательный центр Кабардино-Балкарского научного центра Российской академии наук</institution></aff><aff><institution xml:lang="en">Scientific and Educational Center, Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Applied Mathematics and Automation – a branch of Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт прикладной математики и автоматизации – филиал Кабардино-Балкарского научного центра Российской академии наук</institution></aff></aff-alternatives><content-language>ru</content-language><pub-date date-type="pub" iso-8601-date="2024-10-07" publication-format="electronic"><day>07</day><month>10</month><year>2024</year></pub-date><pub-date date-type="collection"><year>2024</year></pub-date><volume>26</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>130</fpage><lpage>144</lpage><history><date date-type="received" iso-8601-date="2024-10-06"><day>06</day><month>10</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-10-06"><day>06</day><month>10</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2024, Видзижева Л.М., Канаметова Д.А.</copyright-statement><copyright-statement xml:lang="en">Copyright ©; 2024, Видзижева Л.M., Канаметова Д.A.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Видзижева Л.М., Канаметова Д.А.</copyright-holder><copyright-holder xml:lang="en">Видзижева Л.M., Канаметова Д.A.</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/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rcsi.science/1991-6639/article/view/265574">https://journals.rcsi.science/1991-6639/article/view/265574</self-uri><abstract xml:lang="en"><p>The work is devoted to the study of a differential-difference equation with a fractional derivative of order not exceeding one. For the equation under consideration, a boundary value problem is posed and solved on a manifold that is a countable union of intervals. To solve the problem, we used an analogue of the Green function method, adapted for differential-difference equations. A general representation of the solution to the equation under study has been found, a fundamental solution has been constructed in terms of the Prabhakar function, its properties have been studied, and a theorem on the existence and uniqueness of a solution to the problem under study has been proven.</p></abstract><trans-abstract xml:lang="ru"><p>Работа посвящена исследованию дифференциально-разностного уравнения с дробной производной порядка, не превосходящего единицу. Для рассматриваемого уравнения ставится и решается краевая задача на многообразии, представляющем собой счетное объединение интервалов. Для решения задачи использован аналог метода функции Грина, адаптированный для дифференциально-разностных уравнений. Найдено общее представление решения исследуемого уравнения, в терминах функции Прабхакара построено фундаментальное решение, изучены его свойства, доказана теорема о существовании и единственности решения исследуемой задачи.</p></trans-abstract><kwd-group xml:lang="en"><kwd>fractional derivative</kwd><kwd>McKendrick – Von Foerster equation</kwd><kwd>fractional integration operator</kwd><kwd>fractional differentiation operator</kwd><kwd>differential-difference equation</kwd><kwd>Riemann – Liouville integral</kwd><kwd>difference operators</kwd><kwd>Prabhakar function</kwd><kwd>Mittag-Leffler function</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дробная производная</kwd><kwd>уравнение Мак-Кендрика – Фон Ферстера</kwd><kwd>оператор дробного интегрирования</kwd><kwd>оператор дробного дифференцирования</kwd><kwd>дифференциально-разностное уравнение</kwd><kwd>интеграл Римана – Лиувилля</kwd><kwd>разностные операторы</kwd><kwd>функция Прабхакара</kwd><kwd>функция Миттаг-Леффлера</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Nakhushev A.M. 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