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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">mathematics</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник российских университетов. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Universities Reports. Mathematics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2686-9667</issn><issn pub-type="epub">2782-3342</issn><publisher><publisher-name>Тамбовский государственный университет имени Г.Р. Державина</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mathematics-175</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>НАУЧНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>О применении методологии i -гладкого анализа к разработке численных методов решения функционально-дифференциальных уравнений</article-title><trans-title-group xml:lang="en"><trans-title>On application of the i-smooth analysis methodology to elaboration of numerical methods for solving functional differential equations</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>Ким</surname><given-names>Аркадий Владимирович</given-names></name><name name-style="western" xml:lang="en"><surname>Kim</surname><given-names>Arkadii V.</given-names></name></name-alternatives><email xlink:type="simple">avkim@imm.uran.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУН «Институт математики и механики им. Н. Н. Красовского» Уральского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N. N. Krasovskii Institute of Mathematics and Mechanics of the Ural Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>06</day><month>04</month><year>2021</year></pub-date><volume>26</volume><issue>133</issue><fpage>26</fpage><lpage>34</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ким А.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Ким А.В.</copyright-holder><copyright-holder xml:lang="en">Kim A.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://mathematics.elpub.ru/jour/article/view/175">https://mathematics.elpub.ru/jour/article/view/175</self-uri><abstract><p>В статье обсуждается ряд аспектов применения i-гладкого анализа в разработке численных методов решения функционально-дифференциальных уравнений (ФДУ). На конкретных примерах демонстрируется принцип разделения конечномерных и бесконечномерных составляющих в структуре численных схем для ФДУ, а также применение различных типов интерполяции предыстории: Лагранжа и Эрмита. Представлен общий подход к построению численных методов типа Рунге–Кутты для нелинейных дифференциальных уравнений нейтрального типа. Получены условия сходимости и установлен порядок сходимости таких методов.</p></abstract><trans-abstract xml:lang="en"><p>The article discusses a number of aspects of the application of i-smooth analysis in the development of numerical methods for solving functional differential equations (FDE). The principle of separating finite- and infinite-dimensional components in the structure of numerical schemes for FDE is demonstrated with concrete examples, as well as the usage of different types of prehistory interpolation, those by Lagrange and Hermite. A general approach to constructing Runge–Kutta-like numerical methods for nonlinear neutral differential equations is presented. Convergence conditions are obtained and the order of convergence of such methods is established.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>функционально-дифференциальные уравнения</kwd><kwd>численные методы</kwd><kwd>i -гладкий анализ</kwd><kwd>системы с последействием</kwd></kwd-group><kwd-group xml:lang="en"><kwd>functional differential equations</kwd><kwd>numerical methods</kwd><kwd>i -smooth analysis</kwd><kwd>systems with delays</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке РФФИ (проект № 20-01-00352_а).</funding-statement><funding-statement xml:lang="en">The work is partially supported by the Russian Foundation for Basic Research (project no. 20-01-00352_а).</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">A. V. Kim, V. G. Pimenov, Numerical Methods for Delay Differential Equations. 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