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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">10.25587/2411-9326-2025-3-95-112</article-id><article-id custom-type="elpub" pub-id-type="custom">matmess-99</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>Задача типа Коши и обратные задачи для уравнений с регулярным интегро-дифференциальным оператором типа Римана — Лиувилля и замкнутым оператором</article-title><trans-title-group xml:lang="en"><trans-title>A Cauchy type problem and inverse problems for equations with a Riemann–Liouville type regular integro-differential operator and a closed operator</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>Федоров</surname><given-names>В. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedorov</surname><given-names>V. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Федоров Владимир Евгеньевич</p><p>ул. Бр. Кашириных, 129, комн. 447, Челябинск 454001</p></bio><bio xml:lang="en"><p>Vladimir E. Fedorov</p><p>129 Kashirin Brothers Street, Chelyabinsk 454001</p></bio><email xlink:type="simple">kar@csu.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>Нагуманова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Nagumanova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нагуманова Анна Викторовна</p><p>ул. Бр. Кашириных, 129, комн. 447, Челябинск 454001</p></bio><bio xml:lang="en"><p>Anna V. Nagumanova</p><p>129 Kashirin Brothers Street, Chelyabinsk 454001</p></bio><email xlink:type="simple">urazaeva_anna@mail.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>Сагимбаева</surname><given-names>А. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Sagimbaeva</surname><given-names>A. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сагимбаева Ангелина Олеговна</p><p>ул. Бр. Кашириных, 129, комн. 447, Челябинск 454001</p></bio><bio xml:lang="en"><p>Angelina O. Sagimbaeva</p><p>129 Kashirin Brothers Street, Chelyabinsk 454001</p></bio><email xlink:type="simple">angsag@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Челябинский государственный университет, кафедра математического анализа</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Mathematical Analysis Department, Chelyabinsk State University</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>09</month><year>2025</year></pub-date><volume>32</volume><issue>3</issue><fpage>95</fpage><lpage>112</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Федоров В.Е., Нагуманова А.В., Сагимбаева А.О., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Федоров В.Е., Нагуманова А.В., Сагимбаева А.О.</copyright-holder><copyright-holder xml:lang="en">Fedorov V.E., Nagumanova A.V., Sagimbaeva A.O.</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/99">https://matmess.elpub.ru/jour/article/view/99</self-uri><abstract><p>Исследуется однозначная разрешимость задачи типа Коши и линейных обратных коэффициентных задач для эволюционного уравнения в банаховом пространстве с интегро-дифференциальным оператором типа Римана — Лиувилля первого порядка с регулярным ядром. Оператор при неизвестной функции в уравнении предполагается замкнутым. Получены условия существования и единственности решения задачи типа Коши для линейного неоднородного уравнения. Найден критерий корректной разрешимости для обратной задачи со стационарным неизвестным коэффициентом и с интегральным в смысле Римана — Стилтьеса условием переопределения, включающим в себя условие финального переопределения как частный случай. Найдены условия разрешимости и устойчивости решения обратной задачи с нестационарным неизвестным коэффициентом и абстрактным условием переопределения на полуинтервале. Полученные абстрактные результаты использованы при исследовании линейных обратных начально-краевых задач для уравнений с интегро-дифференциальным оператором типа Римана — Лиувилля первого порядка по временной переменной, с многочленами от самосопряженного эллиптического дифференциального оператора по пространственным переменным и с неизвестным коэффициентом в правой части.</p></abstract><trans-abstract xml:lang="en"><p>The unique solvability of a Cauchy-type problem and linear inverse coefficient problems for an evolution equation in a Banach space with a first-order Riemann– Liouville integro-differential operator with a regular kernel is investigated. The operator at the unknown function in the equation is assumed to be closed. The conditions for the existence and uniqueness of a solution of the Cauchy type problem for a linear inhomogeneous equation are obtained. A criterion of correct solvability is found for the inverse problem with a stationary unknown coefficient and with an integral overdetermination condition in the Riemann–Stieltjes sense, which includes the condition of final overdetermination as a special case. The conditions for the solvability and stability of a solution of the inverse problem with a nonstationary unknown coefficient and an abstract overdetermination condition on the interval are found. The abstract results obtained are used in the study of linear inverse initial boundary value problems for equations with a firstorder Riemann–Liouville type regular integro-differential operator in a time variable, with polynomials with respect to a self-adjoint elliptic differential operator in spatial variables and with an unknown coefficient.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>интегро-дифференциальный оператор типа Римана — Лиувилля</kwd><kwd>линейное эволюционное уравнение в банаховом пространстве</kwd><kwd>задача типа Коши</kwd><kwd>линейная обратная коэффициентная задача</kwd><kwd>начально-краевая задача.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Riemann–Liouville type regular integro-differential operator</kwd><kwd>linear evolution equation in a Banach space</kwd><kwd>Cauchy type problem</kwd><kwd>linear inverse coefficient problem</kwd><kwd>initial boundary value problem.</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">Kozhanov A. 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