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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">10.29235/1561-8323-2022-66-1-7-11</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1032</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 смешанной задачи для нелинейного уравнения</article-title><trans-title-group xml:lang="en"><trans-title>Classical solution of the mixed problem for a nonlinear equation</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>Корзюк Виктор Иванович – академик, доктор физико-математических наук, профессор.</p><p>Ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Korzyuk Viktor I. – Academician, D. Sc. (Physics and Mathematics), Professor.</p><p>11, Surganov Str., 220072, 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 – магистрант.</p><p>Пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Rudzko Jan V. – Master’s degree student.</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, Национальная академия наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics, 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>09</day><month>03</month><year>2022</year></pub-date><volume>66</volume><issue>1</issue><fpage>7</fpage><lpage>11</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://doklady.belnauka.by/jour/article/view/1032">https://doklady.belnauka.by/jour/article/view/1032</self-uri><abstract><p>В данном сообщении рассматривается первая смешанная задача для нелинейного гиперболического уравнения в четверти плоскости, где на нижнем основании задаются условия Коши, а на боковой границе задается условие Дирихле. Решение строится методом характеристик в неявном аналитическом виде как решение интегрального уравнения. Проводится исследование разрешимости интегральных уравнений, гладкости решений и их зависимости от начальных данных. Доказывается единственность и устанавливаются условия, при которых существует кусочно-гладкое и классическое решение смешанной задачи.</p></abstract><trans-abstract xml:lang="en"><p>The first mixed problem for a nonlinear equation is considered in the quarter plane. The Cauchy conditions are set at the bottom of the boundary. The Dirichlet condition is set on the left part of the boundary. The solution is constructed using the method of characteristics in an implicit analytical form as a solution of the integral equation. The solvability of these integral equations, the smoothness of the solutions, and their dependence on the initial data are investigated. The uniqueness is proved and the conditions are established, under which there exists a piecewise smooth and classical solution of the first mixed problem.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>нелинейное уравнение</kwd><kwd>классическое решение</kwd><kwd>смешанная задача</kwd><kwd>метод характеристик</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nonlinear equation</kwd><kwd>classical solution</kwd><kwd>mixed problem</kwd><kwd>method of characteristics</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">Физическая энциклопедия: в 5 т. / редкол.: А. М. Прохоров (гл. ред.) [и др.]. – М., 1992. – Т. 3. – 642 с.</mixed-citation><mixed-citation xml:lang="en">Prokhorov A. M. [et al.], eds. Physical Encyclopedia: in 5 vol. Moscow, 1992, vol. 3. 642 p. 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