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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2023-14-5-511-517</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-287</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="en"><subject>MATHEMATICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>Boundary value problem for a degenerate equation with a Riemann–Liouville operator</article-title><trans-title-group xml:lang="ru"><trans-title>Краевая задача для вырождающегося уравнения с оператором Римана-Лиувилля</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7204-9127</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иргашев</surname><given-names>Б. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Irgashev</surname><given-names>B. Yu.</given-names></name></name-alternatives><bio xml:lang="en"><p>Bakhrom Yu. Irgashev</p><p>Namangan</p></bio><email xlink:type="simple">bahromirgasev@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Наманганский инженерно-строительный институт,  Институт математики имени В.И.Романовского Академии наук Республики Узбекистан</institution></aff><aff xml:lang="en"><institution>Namangan Engineering Construction Institute; Institute of Mathematics named after V. I. Romanovsky of the Academy of Sciences of the Republic of Uzbekistan</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>08</day><month>06</month><year>2025</year></pub-date><volume>14</volume><issue>5</issue><fpage>511</fpage><lpage>517</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Irgashev B.Y., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Иргашев Б.Ю.</copyright-holder><copyright-holder xml:lang="en">Irgashev B.Y.</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://nanojournal.ifmo.ru/jour/article/view/287">https://nanojournal.ifmo.ru/jour/article/view/287</self-uri><abstract><p>In the article, the uniqueness and solvability of one boundary value problem for a high-order equation with two lines of degeneracy with a fractional Riemann–Liouville derivative in a rectangular domain is studied by the Fourier method. Sufficient conditions for the well-posedness of the problem posed are obtained.</p></abstract><trans-abstract xml:lang="ru"><p>В статье методом Фурье исследуется единственность и разрешимость одной краевой задачи, в прямоугольной области, для уравнения высокого порядка с дробной производной Римана-Лиувилля с двумя линиями вырождения. Получены достаточные условия корректности поставленной задачи.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Уравнение высокого порядка</kwd><kwd>начально-краевая задача</kwd><kwd>дробная производная в смысле Римана-Лиувилля</kwd><kwd>собственное значение</kwd><kwd>собственная функция</kwd><kwd>функция Килбаса-Сайго</kwd><kwd>ряд</kwd><kwd>сходимость</kwd><kwd>существование</kwd><kwd>единственность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>high order equation</kwd><kwd>initial-boundary value problem</kwd><kwd>fractional derivative in the sense of Riemann– Liouville</kwd><kwd>eigenvalue</kwd><kwd>eigenfunction</kwd><kwd>Kilbas-Saigo function</kwd><kwd>series</kwd><kwd>convergence</kwd><kwd>existence</kwd><kwd>uniqueness</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bogolyubov A.N., Koblikov A.A., Smirnova D.D. and Shapkina N.E. 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