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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">37482</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2023-69-4-664-675</article-id><article-id pub-id-type="edn">ZDAWGY</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">Boundary-value problems for differential-difference equations with  nite and in nite orbits of boundaries</article-title><trans-title-group xml:lang="ru"><trans-title>Краевые задачи для дифференциально-разностных уравнений с конечными и бесконечными орбитами границ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanova</surname><given-names>E. P.</given-names></name><name xml:lang="ru"><surname>Иванова</surname><given-names>Е. П.</given-names></name></name-alternatives><email>elpaliv@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Moscow Aviation Institute (National Research University)</institution></aff><aff><institution xml:lang="ru">Московский авиационный институт (национальный исследовательский университет)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2023</year></pub-date><volume>69</volume><issue>4</issue><issue-title xml:lang="en">VOL 69, NO4 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 69, №4 (2023)</issue-title><fpage>664</fpage><lpage>675</lpage><history><date date-type="received" iso-8601-date="2024-01-18"><day>18</day><month>01</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Ivanova E.P.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Иванова Е.П.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Ivanova E.P.</copyright-holder><copyright-holder xml:lang="ru">Иванова Е.П.</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/37482">https://journals.rudn.ru/CMFD/article/view/37482</self-uri><abstract xml:lang="en"><p>We consider boundary-value problems for differential-difference equations containing incommensurable shifts of arguments in the higher-order terms. We show that for the case when the orbits of the domain boundary generated by the set of shifts of the difference operator are nite, the original problem is similar to the boundary-value problem for differential-difference equations with integer shifts of arguments. The case of an in nite boundary orbit is also studied.</p></abstract><trans-abstract xml:lang="ru"><p>Рассматриваются краевые задачи для дифференциально-разностных уравнений, содержащих несоизмеримые сдвиги аргументов в старших членах. Показано, что для случая, когда орбиты границы области, сгенерированные множеством сдвигов разностного оператора, конечны, исходная задача аналогична краевой задаче для дифференциально-разностных уравнений с целочисленными сдвигами аргументов. Исследуется также случай бесконечной орбиты границы.</p></trans-abstract><kwd-group xml:lang="en"><kwd>differential-difference equation</kwd><kwd>boundary-value problem</kwd><kwd>incommensurable shifts of arguments</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дифференциально-разностное уравнение</kwd><kwd>краевая задача</kwd><kwd>несоизмеримые сдвиги аргументов</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Россовский Л. Е. Эллиптические функционально-дифференциальные уравнения со сжатием и растяжением аргументов неизвестной функции// Соврем. мат. Фундам. направл. - 2014. - 54, № 2. - С. 3-138.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Скубачевский А. Л. Краевые задачи для эллиптических дифференциально-разностных уравнений и их приложения// Усп. мат. наук. - 2016. - 32, № 2. - С. 261-278.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Ivanova E. P. 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