<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<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">42619</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2024-70-4-679-690</article-id><article-id pub-id-type="edn">WWORZS</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">Linear inverse problems for integro-differential equations in Banach spaces with a bounded operator</article-title><trans-title-group xml:lang="ru"><trans-title>Линейные обратные задачи для интегро-дифференциальных уравнений в банаховых пространствах с ограниченным оператором</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fedorov</surname><given-names>V. E.</given-names></name><name xml:lang="ru"><surname>Федоров</surname><given-names>В. Е.</given-names></name></name-alternatives><email>kar@csu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Godova</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Годова</surname><given-names>А. Д.</given-names></name></name-alternatives><email>sashka_1997_godova55@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Chelyabinsk State University</institution></aff><aff><institution xml:lang="ru">Челябинский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>70</volume><issue>4</issue><issue-title xml:lang="en">VOL 70, NO4 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 70, №4 (2024)</issue-title><fpage>679</fpage><lpage>690</lpage><history><date date-type="received" iso-8601-date="2025-01-27"><day>27</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Fedorov V.E., Godova A.D.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Федоров В.Е., Годова А.Д.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Fedorov V.E., Godova A.D.</copyright-holder><copyright-holder xml:lang="ru">Федоров В.Е., Годова А.Д.</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/42619">https://journals.rudn.ru/CMFD/article/view/42619</self-uri><abstract xml:lang="en"><p>In this paper, we study the questions of well-posedness of linear inverse problems for equations in Banach spaces with an integro-differential operator of the Riemann-Liouville type and a bounded operator at the unknown function. A criterion of well-posedness is found for a problem with a constant unknown parameter; in the case of a scalar convolution kernel in an integro-differential operator, this criterion is formulated as conditions for the characteristic function of the inverse problem not to vanish on the spectrum of a bounded operator. Sufficient well-posedness conditions are obtained for a linear inverse problem with a variable unknown parameter. Abstract results are used in studying a model inverse problem for a partial differential equation.</p></abstract><trans-abstract xml:lang="ru"><p>Исследованы вопросы корректности линейных обратных задач для уравнений в банаховых пространствах с интегро-дифференциальным оператором типа Римана-Лиувилля и ограниченным оператором при искомой функции. Найден критерий корректности для задачи с постоянным неизвестным параметром, в случае скалярного ядра свертки в интегродифференциальном операторе этот критерий сформулирован в виде условий необращения в нуль характеристической функции обратной задачи на спектре ограниченного оператора. Для линейной обратной задачи с переменным неизвестным параметром получены достаточные условия корректности. Абстрактные результаты использованы при исследовании модельной обратной задачи для уравнения в частных производных.</p></trans-abstract><kwd-group xml:lang="en"><kwd>inverse problem</kwd><kwd>integro-differential equation</kwd><kwd>Riemann-Liouville type operator</kwd><kwd>wellposedness</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>обратная задача</kwd><kwd>интегро-дифференциальное уравнение</kwd><kwd>оператор типа Римана-Лиувилля</kwd><kwd>корректность</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was supported by a grant from the Russian Science Foundation and the Government of the Chelyabinsk Region (project 24-21-20015).</funding-statement><funding-statement xml:lang="ru">Работа поддержана грантом РНФ и Правительства Челябинской области (проект 24-21-20015).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Данфорд Н., Шварц Дж. Линейные операторы. Общая теория.-М.: Иностр. лит., 1962.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Нахушев А.М. Дробное исчисление и его применение. -М.: Физматлит, 2003.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Прилепко А.И. Метод полугрупп решения обратных, нелокальных и неклассических задач. Прогноз-управление и прогноз-наблюдение эволюционных уравнений. I// Дифф. уравн.- 2005.- 41, № 11.- С. 1560-1571.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Псху А.В. Уравнения в частных производных дробного порядка.-М.: Наука, 2005.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Самко С.Г., Килбас А.А., Маричев О.И. Интегралы и производные дробного порядка и некоторые их приложения.-Минск: Наука и техника, 1987.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Федоров В.Е., Годова А.Д. Интегро-дифференциальные уравнения в банаховых пространствах и аналитические разрешающие семейства операторов// Соврем. мат. Фундам. направл.-2023.- 69, № 1. -С. 166-184.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Ashurov R.R., Kadirkulov B. J., Turmetov B.Kh. On the inverse problem of the Bitsadze-Samarskii type for a fractional parabolic equation// Пробл. анализа.-2023.-12, № 3.- С. 20-40.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Atangana A., Baleanu D. New fractional derivatives with nonlocal and non-singular kernel: Theory and application to heat transfer model// Thermal Sci. -2016.- 20.-C. 763-769.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Caputo M., Fabrizio M. A new definition of fractional derivative without singular kernel// Progr. Fract. Differ. Appl. - 2015.- 1, № 2. -С. 1-13.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Fedorov V.E., Godova A.D., Kien B.T. Integro-differential equations with bounded operators in Banach spaces// Bullю Karaganda Univ. Math. Ser.-2022.-№ 2.-С. 93-107.</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>Fedorov V.E., Ivanova N.D. Identification problem for degenerate evolution equations of fractional order// Fract. Calc. Appl. Anal.- 2017.- 20, № 3.-С. 706-721.</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Fedorov V.E., Kosti´c M. Identification problem for strongly degenerate evolution equations with the Gerasimov-Caputo derivative// Differ. Equ. -2020.-56, № 12.-С. 1613-1627.</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Fedorov V.E., Nagumanova A.V., Avilovich A.S. A class of inverse problems for evolution equations with the Riemann-Liouville derivative in the sectorial case// Math. Methods Appl. Sci. - 2021.- 44, № 15.- С. 11961-11969.</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>Glushak A.V. On an inverse problem for an abstract differential equation of fractional order// Math. Notes.- 2010.- 87, № 5-6.- С. 654-662.</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Kilbas A.A., Srivastava H.M., Trujillo J.J. Theory and applications of fractional differential equations.- Amsterdam-Boston-Heidelberg: Elsevier Science Publ., 2006.</mixed-citation></ref><ref id="B16"><label>16.</label><mixed-citation>Kosti´c M. Abstract Volterra integro-differential equations.- Boca Raton: CRC Press, 2015.</mixed-citation></ref><ref id="B17"><label>17.</label><mixed-citation>Kostin A.B., Piskarev S.I. Inverse source problem for the abstract fractional differential equation// J. Inverse Ill-Posed Probl. -2021.- 29, № 2.- С. 267-281.</mixed-citation></ref><ref id="B18"><label>18.</label><mixed-citation>Orlovsky D.G. Parameter determination in a differential equation of fractional order with Riemann- Liouville fractional derivative in a Hilbert space// Журн. СФУ. Сер. Мат. и физ.-2015.- 8, № 1.- С. 55-63.</mixed-citation></ref><ref id="B19"><label>19.</label><mixed-citation>Orlovsky D.G. Determination of the parameter of the differential equation of fractional order with the Caputo derivative in Hilbert space// J. Phys. Conf. Ser.- 2019.- 1205, № 1.- 012042.</mixed-citation></ref><ref id="B20"><label>20.</label><mixed-citation>Orlovsky D., Piskarev S. Inverse problem with final overdetermination for time-fractional differential equation in a Banach space// J. Inverse Ill-Posed Probl. -2022.-30, № 2.- С. 221-237.</mixed-citation></ref><ref id="B21"><label>21.</label><mixed-citation>Prabhakar T.R. A singular integral equation with a generalized Mittag-Leffler function in the kernel// Yokohama Math. J.-1971.-19.- С. 7-15.</mixed-citation></ref><ref id="B22"><label>22.</label><mixed-citation>Dа Prato G., Iannelli M. Linear integro-differential equations in Banach spaces// Rend. Semin. Mat. Univ. Padova.- 1980.-62.-С. 207-219.</mixed-citation></ref><ref id="B23"><label>23.</label><mixed-citation>Pru¨ss J. Evolutionary integral equations and applications.- Basel: Springer, 1993.</mixed-citation></ref></ref-list></back></article>
