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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 custom-type="elpub" pub-id-type="custom">vestifm-227</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>О ПРИБЛИЖЕННЫХ ФОРМУЛАХ ДЛЯ ВЫЧИСЛЕНИЯ ОДНОГО КЛАССА ФУНКЦИОНАЛОВ ОТ ПУАССОНОВСКОГО ПРОЦЕССА</article-title><trans-title-group xml:lang="en"><trans-title>APPROXIMATE FORMULAS FOR EVALUATION OF ONE-CLASS FUNCTIONALS OF THE POISSON PROCESS</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>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>доктор физико- математических наук, главный научный сотрудник</p></bio><bio xml:lang="en"><p>D. Sc. (Physics and Mathematics), Chief Researcher</p></bio><email xlink:type="simple">egorov@im.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук Беларуси, Минск</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus, Minsk</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>30</day><month>04</month><year>2017</year></pub-date><volume>0</volume><issue>1</issue><fpage>7</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Егоров А.Д., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Егоров А.Д.</copyright-holder><copyright-holder xml:lang="en">Egorov A.D.</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/227">https://vestifm.belnauka.by/jour/article/view/227</self-uri><abstract><p>Данная работа посвящена построению приближенных формул для вычисления математического ожидания нелинейных функционалов от случайных процессов. Предполагается, что рассматриваемые случайные процессы допускают хаотические разложения по кратным пуассоновским стохастическим интегралам. Используется подход, основанный на требовании точности приближенных формул для функциональных многочленов третьей степени от траекторий процесса. Применение формул рассматриваемого типа связано с их использованием в качестве элементарных при построении составных формул, сходящихся к точным значениям ожиданий, а также в качестве аппро­ксимаций математических ожиданий на малом временном промежутке. В случае разложения в бесконечный ряд рассматриваются аппроксимационно точные формулы, в которых используется конечный отрезок хаотического разложения.</p><p> </p></abstract><trans-abstract xml:lang="en"><p>This work is devoted to the construction of approximate formulas for calculation of mathematical expectation of nonlinear functionals defined along the trajectories of random processes. Computation of mathematical expectation of functionals of random processes by the quadrature method is the task that depends heavily on a form in which the process is given. A lot of functional quadrature formulas are built in the cases where the characteristic functional of the process is known in explicit form. Some results are obtained in the cases where the process is the solution of the stochastic differential Itό equation. Recently, the author has proposed the approach to an approximate evaluation of mathematical expectation of a class of nonlinear random functionals based on the use of the Wiener chaos expansion. The article uses chaos expansion with respect to multiple Poisson – Ito integrals to construct functional quadrature formulas for calculating nonlinear functionals of the stochastic process defined on the probability space generated by the Poisson process. The formula is exact for the thirddegree symmetric functional polynomial, so the product formula of multiple Poisson – Ito integrals is used for construction.</p><p> </p></trans-abstract><kwd-group xml:lang="ru"><kwd>функционалы от случайных процессов</kwd><kwd>математические ожидания</kwd><kwd>приближенные формулы</kwd><kwd>кратные пуассоновские стохастические интегралы</kwd><kwd>хаотические разложения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>functionals of random processes</kwd><kwd>mathematical expectations</kwd><kwd>approximate formulas</kwd><kwd>multiple stochastic Poisson stochastic integrals</kwd><kwd>chaotic expansions</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">Egorov, A. D. Functional integrals: Approximate evaluations and applications / A. D. Egorov, P. I. Sobolevsky, L. A. 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