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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">10.29235/1561-2430-2020-56-2-166-174</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-518</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 функциональных интегралов</article-title><trans-title-group xml:lang="en"><trans-title>Semiclassical approximation of 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 физикоматематических наук, главный научный сотрудник</p><p>ул. Сурганова, 11, 220072, г. Минск </p></bio><bio xml:lang="en"><p>Victor B. Malyutin – Dr. Sc. (Physics and Mathematics), Principal 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-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, доцент</p><p>ул. Ч. Абдирова, 1, 230112, г. Нукус </p></bio><bio xml:lang="en"><p>Berdakh O. Nurjanov – Ph. D. (Physics and Mathematics), Assistant Professor,</p><p>1, Ch. Abdirov Str., 230112, Nukus </p></bio><email xlink:type="simple">nurjanov@list.ru</email><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>Каракалпакский государственный университет имени Бердаха</institution></aff><aff xml:lang="en"><institution>Karakalpak State University named after Berdakh</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>08</day><month>07</month><year>2020</year></pub-date><volume>56</volume><issue>2</issue><fpage>166</fpage><lpage>174</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Малютин В.Б., Нуржанов Б.О., 2020</copyright-statement><copyright-year>2020</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/518">https://vestifm.belnauka.by/jour/article/view/518</self-uri><abstract><p>Рассматривается квазиклассическая аппроксимация для вычисления функциональных интегралов специального вида по условной мере Винера. В этой аппроксимации используется разложение действия относительно классической траектории. При этом учитываются три первых члена разложения. Квазиклассическая аппроксимация может интерпретироваться как разложение по степеням постоянной Планка. Новизна данной работы заключается в численном анализе точности квазиклассической аппроксимации функциональных интегралов. Для численного анализа используется сравнение результатов. Одни результаты получаются с помощью квазиклассической аппроксимации, другие – с помощью метода вычисления функциональных интегралов, основанного на разложении по собственным функциям гамильтониана, порождающего функциональный интеграл.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we consider a semiclassical approximation of special functional integrals with respect to the conditional Wiener measure. In this apptoximation we use the expansion of the action with respect to the classical trajectory. In so doing, the first three terms of expansion are taken into account. Semiclassical approximation may be interpreted as an expansion in powers of the Planck constant. The novelty of this work is the numerical analysis of the accuracy of the semiclassical approximation of functional integrals. A comparison of the results is used for numerical analysis. Some results are obtained by means of semiclassical approximation, while the other by means of the functional integrals calculation method based on the expansion in eigenfunctions of the Hamiltonian generating a functional integral.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>функциональные интегралы</kwd><kwd>квазиклассическая аппроксимация</kwd><kwd>действие</kwd><kwd>классическая траектория</kwd><kwd>собственные функции гамильтониана</kwd></kwd-group><kwd-group xml:lang="en"><kwd>functional integrals</kwd><kwd>semiclassical approximation</kwd><kwd>action</kwd><kwd>classical trajectory</kwd><kwd>eigenfunctions of Hamiltonian</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">Glimm, J. Quantum Physics. A functional integral point of view / J. Glimm, A. 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