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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</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">10.29235/1561-2430-2023-59-1-37-50</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-701</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>Классическое решение задачи для системы уравнений из механики с негладкими условиями Коши</article-title><trans-title-group xml:lang="en"><trans-title>Classical solution of a problem for a system of equations from mechanics with nonsmooth Cauchy conditions</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>Корзюк</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Korzyuk</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Виктор Иванович Корзюк – академик Национальной академии наук Беларуси, доктор физико-математических наук, профессор</p><p>ул. Сурганова, 11, 220072, Минск</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Viktor I. Korzyuk – Academician of the NationalAcademy of Sciences of Belarus, Dr. Sc. (Physics and Mathematics), Professor</p><p>11, Surganov Str., 220072, Minsk</p><p>4, Nezavisimosti Ave., 220030, Minsk</p></bio><email xlink:type="simple">korzyuk@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1482-9106</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рудько</surname><given-names>Я. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rudzko</surname><given-names>J. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рудько Ян Вячеславович – аспирант, магистр (математика и компьютерные науки)</p><p>ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Jan V. Rudzko – Postgraduate Student, Master of Mathematics and Computer Science</p><p>11, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">janycz@yahoo.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук Беларуси; Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus; Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>03</day><month>04</month><year>2023</year></pub-date><volume>59</volume><issue>1</issue><fpage>37</fpage><lpage>50</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Корзюк В.И., Рудько Я.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Корзюк В.И., Рудько Я.В.</copyright-holder><copyright-holder xml:lang="en">Korzyuk V.I., Rudzko J.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://vestifm.belnauka.by/jour/article/view/701">https://vestifm.belnauka.by/jour/article/view/701</self-uri><abstract><p>Изучается смешанная задача в четверти плоскости для одной системы дифференциальных уравнений, описывающая колебания в однородных релаксирующих стержнях постоянного поперечного сечения, которые соответствуют модели Максвелла. На нижнем основании задаются условия Коши, причем одно из них имеет разрыв первого рода в точке. На боковой границе задается гладкое граничное условие. Для одной из функций системы выводится смешанная задача для уравнения Клейна – Гордона – Фока. Решение строится методом характеристик в неявном аналитическом виде как решение интегрального уравнения. Доказывается единственность и устанавливаются условия, при которых существует кусочно-гладкое решение. Для второй функции системы рассматривается задача Коши. Устанавливаются условия, при которых решение системы обладает достаточной степенью гладкости. </p></abstract><trans-abstract xml:lang="en"><p>In this article, we study a mixed problem in a quarter-plane for one system of differential equations, which describes vibrations in the string from viscoelastic material, which corresponds to the Maxwell model. At the bottom of the boundary, we pose the Cauchy conditions, and one of them has a discontinuity of the first kind at one point. We set a smooth boundary condition on the lateral boundary. We derive the Klein – Gordon – Fock equation for one function of the studied system. We use the method of characteristics to build the classical solution as a solution of some integral equation. We prove the uniqueness and establish conditions under which a piecewise smooth solution exists. The Cauchy problem is considered the system’s second function. We determine the conditions under which the solution of the system has sufficient smoothness</p></trans-abstract><kwd-group xml:lang="ru"><kwd>модель Максвелла</kwd><kwd>уравнение Клейна – Гордона – Фока</kwd><kwd>метод характеристик</kwd><kwd>классическое решение</kwd><kwd>смешанная задача</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Maxwell material</kwd><kwd>Klein – Gordon – Fock equation</kwd><kwd>method of characteristics</kwd><kwd>classical solution</kwd><kwd>mixed 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">Корзюк, В. И. Частное решение задачи для системы уравнений из механики с негладкими условиями Коши / В. И. Корзюк, Я. В. Рудько // Вес. Нац. акад. навук Беларусі. Сер. фіз.-мат. навук. – 2022. – Т. 58, № 3. – С. 300–311. https://doi.org/10.29235/1561-2430-2022-58-3-300-311</mixed-citation><mixed-citation xml:lang="en">Korzyuk V. I., Rudzko J. V. 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