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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">10.29235/1561-2430-2018-54-3-279-289</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-332</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>Метод функциональных интегралов для систем стохастических дифференциальных уравнений</article-title><trans-title-group xml:lang="en"><trans-title>Functional integrals method for systems of stochastic 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>Айрян</surname><given-names>Э. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ayryan</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Айрян Эдик Арташевич – кандидат физико-математических наук, заведующий сектором, лаборатория информационных технологий.</p><p>ул.  Жолио-Кюри,  6,  141980, Дубна.</p></bio><bio xml:lang="en"><p>Edik A. Ayryan – Ph. D. (Physics and Mathematics), Head of the Sector of the Laboratory of Information Technologies.</p><p>6, Joliot-Curie Str., 141980, Dubna.</p></bio><email xlink:type="simple">ayrjan@jinr.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Егоров</surname><given-names>А. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Egorov</surname><given-names>A. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Егоров Александр Дмитриевич – доктор физико-математических наук, главный научный сотрудник.</p><p>ул. Сурганова, 11, 220072, Минск.</p></bio><bio xml:lang="en"><p>Alexandr D. Egorov – D. Sc. (Physics and Mathematics), Chief Researcher.</p><p>11, Surganov Str., 220072, Minsk.</p></bio><email xlink:type="simple">egorov@im.bas-net.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кулябов</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kulyabov</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кулябов Дмитрий Сергеевич – доктор физико-математических наук, доцент, кафедра прикладной информатики и теории вероятностей, Российский университет дружбы народов.</p><p>ул. Миклухо-Маклая, 6, 117198, Москва.</p></bio><bio xml:lang="en"><p>Dmitry S. Kulyabov – D. Sc. (Physics and Mathema- tics), Assistant Professor, Department of Applied Probability and Informatics, RUDN University.</p><p>6, Mikluho-Maklaya Str., 117198,  Moscow.</p></bio><email xlink:type="simple">kulyabov_ds@rudn.university</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Малютин</surname><given-names>В. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Malyutin</surname><given-names>V. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Малютин Виктор Борисович – доктор физико-математических наук, ведущий научный сотрудник.</p><p>ул. Сурганова, 11, 220072, Минск.</p></bio><bio xml:lang="en"><p>Victor B. Malyutin – D. Sc. (Physics and Mathematics), Leading Researcher.</p><p>11, Surganov Str., 220072, Minsk.</p></bio><email xlink:type="simple">malyutin@im.bas-net.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Севастьянов</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sevastyanov</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Севастьянов Леонид Антонович – доктор физико- математических наук, профессор, кафедра прикладной информатики и теории вероятностей, Российский университет дружбы народов.</p><p>ул. Миклухо-Маклая, 6, 117198, Москва.</p></bio><bio xml:lang="en"><p>Leonid A. Sevastyanov – D. Sc. (Physics and Mathematics), Professor, Department of Applied Probability and In- formatics, RUDN University.</p><p>6, Mikluho-Maklaya Str., 117198, Moscow.</p></bio><email xlink:type="simple">sevastianov_la@rudn.university</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Объединенный институт ядерных исследований</institution></aff><aff xml:lang="en"><institution>Joint Institute for Nuclear Research</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><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Объединенный институт ядерных исследований; Российский университет дружбы народов</institution></aff><aff xml:lang="en"><institution>Joint Institute for Nuclear Research; RUDN University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>31</day><month>10</month><year>2018</year></pub-date><volume>54</volume><issue>3</issue><fpage>279</fpage><lpage>289</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Айрян Э.А., Егоров А.Д., Кулябов Д.С., Малютин В.Б., Севастьянов Л.А., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Айрян Э.А., Егоров А.Д., Кулябов Д.С., Малютин В.Б., Севастьянов Л.А.</copyright-holder><copyright-holder xml:lang="en">Ayryan E.A., Egorov A.D., Kulyabov D.S., Malyutin V.B., Sevastyanov L.A.</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/332">https://vestifm.belnauka.by/jour/article/view/332</self-uri><abstract><p>Рассматриваются системы стохастических дифференциальных уравнений, для которых риманово многообразие, порождаемое диффузионной матрицей, имеет нулевую кривизну. Предлагается метод вычисления характеристик решения рассматриваемых систем стохастических дифференциальных уравнений, который основывается на представлении функции плотности вероятности перехода через функциональный интеграл. Для вычисления возникающих функциональных интегралов используется разложение действия относительно классической траектории, для которой действие принимает экстремальное значение. Классическая траектория находится как решение многомерного уравнения Эйлера – Лагранжа.</p></abstract><trans-abstract xml:lang="en"><p>Systems of stochastic differential equations, for which the Riemannian manifold generated by a diffusion matrix has zero curvature, are considered in this article. The method for approximate evaluation of characteristics of the solution of the systems of stochastic differential equations is proposed. This method is based on the representation of the probability density function through the functional integral. To compute functional integrals we use the expansion of action with respect to a classical trajectory, for which the action takes an extreme value. The classical trajectory is found as the solution of the multidimensional Euler – Lagrange equation.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>системы стохастических дифференциальных уравнений</kwd><kwd>Onsager–Machlup функционалы</kwd><kwd>функциональные интегралы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>systems of stochastic differential equations</kwd><kwd>Onsager – Machlup functionals</kwd><kwd>functional integrals</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">Gardiner, C. W. Handbook of Stochastic Methods: For Physics, Chemistry, and the Natural Sciences / C. W. 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