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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">10.29235/1561-2430-2023-59-4-302-307</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-744</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>Квазиклассическая аппроксимация кратных функциональных интегралов</article-title><trans-title-group xml:lang="en"><trans-title>The semiclassical approximation of multiple functional integrals</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>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, заведующий отделом</p><p>ул. Сурганова, 11, 220072, Минск</p><p> </p></bio><email xlink:type="simple">malyutin@im.bas-net.by</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>Нуржанов</surname><given-names>Б. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Nurjanov</surname><given-names>B. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нуржанов Бердах Орынбаевич – кандидат физико-математических наук, старший научный сотрудник, Институт математики имени В. И. Романовского Академии наук Республики Узбекистан; Каракалпакский государственный университет имени Бердаха</p><p>ул. Университетская, 9, 100174, Ташкент;ул. Ч. Абдирова, 1, 230112, Нукус, Республика Узбекистан</p></bio><bio xml:lang="en"><p>Berdakh O. Nurjanov – Ph. D. (Physics and Mathematics), Senior Researcher, Institute of Mathematics named after V. I. Romanovsky of the Academy of Sciences of the Republic of Uzbekistan ; Karakalpak State University named after Berdakh</p><p>9, University Str., 100174, Tashkent, Republic of Uzbekistan; 1, Ch. Abdirov Str., 230112, Nukus, Republic of Uzbekistan </p></bio><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;</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-2"><aff xml:lang="ru"><institution>Институт математики имени В. И. Романовского Академии наук Республики Узбекистан; &#13;
Каракалпакский государственный университет имени Бердаха</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics named after V. I. Romanovsky of the Academy of Sciences of the Republic of Uzbekistan; &#13;
Karakalpak State University named after Berdakh</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2024</year></pub-date><volume>59</volume><issue>4</issue><fpage>302</fpage><lpage>307</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Малютин В.Б., Нуржанов Б.О., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Малютин В.Б., Нуржанов Б.О.</copyright-holder><copyright-holder xml:lang="en">Malyutin V.B., Nurjanov B.O.</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/744">https://vestifm.belnauka.by/jour/article/view/744</self-uri><abstract><p>Исследуется квазиклассическая аппроксимация кратных функциональных интегралов. Интегралы определяются через лагранжиан и действие. Из всех возможных траекторий наибольший вклад в интеграл дает классическая x̅cl, для которой действие S принимает экстремальное значение. Классическая траектория находится как решение многомерного уравнения Эйлера – Лагранжа. Для вычисления функциональных интегралов используется разложение действия относительно классической траектории, которое может интерпретироваться как разложение по степеням постоянной Планка. Приводятся численные результаты для квазиклассической аппроксимации двукратных функциональных интегралов.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we study the semiclassical approximation of multiple functional integrals. The integrals are defined through the Lagrangian and the action. Of all possible trajectories, the greatest contribution to the integral is given by the classical trajectory x̅cl for which the action S takes an extremal value. The classical trajectory is found as a solution of the multidimensional Euler – Lagrange equation. To calculate the functional integrals, the expansion of the action with respect to the classical trajectory is used, which can be interpreted as an expansion in powers of Planck’s constant. The numerical results for the semiclassical approximation of double functional integrals are given.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>кратные функциональные интегралы</kwd><kwd>квазиклассическая аппроксимация</kwd><kwd>действие</kwd><kwd>классическая траектория</kwd></kwd-group><kwd-group xml:lang="en"><kwd>multiple functional integrals</kwd><kwd>semiclassical approximation</kwd><kwd>action</kwd><kwd>classical trajectory</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">Feynman R. P., Hibbs A. R. Quantum Mechanics and Path Integrals. 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