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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">10.29235/1561-2430-2022-58-3-300-311</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-666</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>Частное решение задачи для системы уравнений из механики с негладкими условиями Коши</article-title><trans-title-group xml:lang="en"><trans-title>A particular solution of a problem for a system of equations from mechanics with nonsmooth Cauchy condition</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 ;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 andMathematics), Professor</p><p>11, Surganov Str., 220072, Minsk;  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 – магистр (математикаи компьютерные науки)</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>an V. Rudzko – Master of Mathematics and ComputerScience</p><p>4, Nezavisimosti Ave., 220030, 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>Belarusian State University;Institute of Mathematics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><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>2022</year></pub-date><pub-date pub-type="epub"><day>12</day><month>10</month><year>2022</year></pub-date><volume>58</volume><issue>3</issue><fpage>300</fpage><lpage>311</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Корзюк В.И., Рудько Я.В., 2022</copyright-statement><copyright-year>2022</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/666">https://vestifm.belnauka.by/jour/article/view/666</self-uri><abstract><p>Изучается смешанная задача в четверти плоскости для системы дифференциальных уравнений, описывающих 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. Система порождает уравнение Клейна – Гордона – Фока. Частное решение строится двумя способами: в явном аналитическом виде, с продолжением функции, и методом характеристик как решение интегрального уравнения, без продолжения функции. Устанавливаются условия, при которых решение 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 a system of differential equations, which describes vibrations in a string from viscoelastic material, which corresponds to Maxwell material. At the bottom of the boundary, the Cauchy conditions are specified, and one of them has a discontinuity of the first kind at one point. A smooth boundary condition is set at the side boundary. The Klein – Gordon – Fock equation is derived for one of the system’s functions. We find a particular solution in two ways. The first method builds it in an explicit analytical form (with a continuation of one function), and the second one constructs it as a solution of an integral equation using the method of characteristics (without continuation of one function). Conditions are established under which the solution 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>частное 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>particular 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">Лазарян, В. А. 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