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<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">22251</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2019-65-3-513-546</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>New Results</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Новые результаты</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">On Inner Regularity of Solutions of Two-Dimensional Zakharov-Kuznetsov Equation</article-title><trans-title-group xml:lang="ru"><trans-title>О внутренней регулярности решений двумерного уравнения Захарова-Кузнецова</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Faminskii</surname><given-names>A V</given-names></name><name xml:lang="ru"><surname>Фаминский</surname><given-names>А В</given-names></name></name-alternatives><email>afaminskii@sci.pfu.edu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>65</volume><issue>3</issue><issue-title xml:lang="en">Proceedings of the Crimean Autumn Mathematical School-Symposium</issue-title><issue-title xml:lang="ru">Труды Крымской осенней математической школы-симпозиума</issue-title><fpage>513</fpage><lpage>546</lpage><history><date date-type="received" iso-8601-date="2019-11-27"><day>27</day><month>11</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/22251">https://journals.rudn.ru/CMFD/article/view/22251</self-uri><abstract xml:lang="en">In this paper, we consider questions of inner regularity of weak solutions of initial-boundary value problems for the Zakharov-Kuznetsov equation with two spatial variables. The initial function is assumed to be irregular, and the main parameter governing the regularity is the decay rate of the initial function at inﬁnity. The main results of the paper are obtained for the problem on a semistrip. In this problem, diﬀerent types of initial conditions (e. g., Dirichlet or Neumann conditions) inﬂuence the inner regularity. We also give a survey of earlier results for other types of areas: a plane, a half-plane, and a strip.</abstract><trans-abstract xml:lang="ru">В статье рассматриваются вопросы внутренней регулярности слабых решений начально-краевых задач для уравнения Захарова-Кузнецова с двумя пространственными переменными. Начальная функция предполагается нерегулярной, а основным параметром, влияющим на регулярность, является скорость убывания начальной функции на бесконечности. Основные результаты работы относятся к случаю задачи, поставленной на полуполосе. При этом различные типы краевых условий (например, Дирихле или Неймана) влияют на характер внутренней регулярности. Приводится также обзор ранее полученных результатов для других типов областей: всей плоскости, полуплоскости и полосы.</trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Антонова А. П., Фаминский А. В. О регулярности решений задачи Коши для уравнения Захарова-Кузнецова в нормах Гельдера// Мат. заметки. - 2015. - 97, № 1. - С. 13-22.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Антонова А. П., Фаминский А. В. О регулярности решений начально-краевой задачи для уравнения Захарова-Кузнецова// Соврем. мат. Фундам. направл. - 2015. - 58. - С. 5-21.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Бесов О. В., Ильин В. П., Никольский С. М. Интегральные представления функций и теоремы вложения. - М.: Наука, 1996.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Захаров В. Е., Кузнецов Е. А. 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