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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2020-64-1-13-20</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-848</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><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>О решении задачи Коши с неограниченной правой частью для уравнений дробного порядка</article-title><trans-title-group xml:lang="en"><trans-title>Cauchy problem for the equations with fractional of Riemann-Liouville derivatives</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>Забрейко</surname><given-names>П. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Zabreiko</surname><given-names>P. P.</given-names></name></name-alternatives><bio xml:lang="en"><p>Petr P. Zabreiko</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пономарева</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Ponomareva</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пономарева Светлана Владимировна - кандидат физико-математических наук, доцент.</p><p>Пр. Независимости, 4, 220050, Минск</p></bio><bio xml:lang="en"><p>Ponomareva Svetlana V. - Ph. D. (Physics and Mathematics), Associate professor.</p></bio><email xlink:type="simple">demyanko@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>19</day><month>03</month><year>2020</year></pub-date><volume>64</volume><issue>1</issue><fpage>13</fpage><lpage>20</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Забрейко П.П., Пономарева С.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Забрейко П.П., Пономарева С.В.</copyright-holder><copyright-holder xml:lang="en">Zabreiko P.P., Ponomareva S.V.</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://doklady.belnauka.by/jour/article/view/848">https://doklady.belnauka.by/jour/article/view/848</self-uri><abstract><p>Изучается вопрос о разрешимости аналога задачи Коши для обыкновенных дифференциальных уравнений с дробными производными Римана-Лиувилля с неограниченной правой частью в определенных пространствах функций. Приводятся условия разрешимости рассматриваемой задачи в данных функциональных пространствах, а также условия существования единственного решения. При исследовании используются метод сведения задачи к уравнению Вольтерра второго рода, принцип Шаудера неподвижной точки в банаховом пространстве и принцип Банаха-Каччиопполи неподвижной точки в полном метрическом пространстве.</p></abstract><trans-abstract xml:lang="en"><p>In this article, we study the question of the solvability of an analogue of the Cauchy problem for ordinary differential equations with fractional Riemann-Liouville derivatives on the unbounded right-hand side in certain function spaces. The solvability conditions of the problem under consideration in given function spaces, as well as the existence conditions of a unique solution are presented. The study uses the method of reducing the problem to the second-kind Volterra equation, the Schauder principle of a fixed point in a Banach space, and the Banach-Cachoppoli principle of a fixed point in a complete metric space.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>задача Коши</kwd><kwd>дробная производная Римана-Лиувилля</kwd><kwd>принцип Шаудера</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Cauchy problem</kwd><kwd>fractional Riemann-Liouville derivative</kwd><kwd>Schauder principle</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Выражаем благодарность профессору кафедры функционального анализа и аналитической экономики А. Б. Антоневичу за многократные обсуждения результатов и ряд ценных советов</funding-statement><funding-statement xml:lang="en">The authors are very grateful to Professor A. B. Antonevich, Chair of Functional Analysis and Economics, for multiple discussions of the obtained results and a number of valuables advices</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Килбас, А. А. Теория и приложения дифференциальных уравнений дробного порядка / А. А. Килбас. - Самара, 2009. - 121 с.</mixed-citation><mixed-citation xml:lang="en">Kilbas A. A. Theory and applications of fractional differential equations. Samara, 2009. 121 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Kilbas, A. A. Theory and Applications of Fractional Differential Equations (North-Holland Mathematics Studies. Vol. 204) / A. A. Kilbas, H. M. Srivastava, J. J. 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