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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">10.29235/1561-2430-2022-58-1-21-33</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-626</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>Об эквивалентности операторного и комбинаторного подходов для одношаговых случайных марковских процессов</article-title><trans-title-group xml:lang="en"><trans-title>On the equivalence of operator and combinatorial approaches for onestep random Markov processes</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</p><p>ул. Жолио-Кюри, 6, 141980, Дубна</p><p>ул. Университетская, 19, 141980, Дубна</p><p>Ереван, Республика Армения </p></bio><bio xml:lang="en"><p>Edik A. Ayryan – Ph. D. (Physics and Mathematics), Head of Sector</p><p>6, Joliot-Curie Str., 141980, Dubna</p><p>19, Universitetskaja Str., 141980, Dubna</p><p>Yerevan, Republic of Armenia </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>Гнатич</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Hnatic</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гнатич Михал – доктор физико-математических наук, профессор, заместитель директора</p><p>ул. Жолио-Кюри, 6, 141980, Дубна</p><p>ул. Ватсонова, 47, 04001, Кошице, Словацкая Республика</p><p>Парк Ангелинум, 9, 04001, Кошице, Словацкая Республика</p></bio><bio xml:lang="en"><p>Michal Hnatic – Dr. Sc. (Physics and Mathematics), Professor, Deputy Director</p><p>6, Joliot-Curie Str., Dubna</p><p>47, Watsonova Str., Košice, Slovak Republic</p><p>9, Park Angelinum, Košice, Slovak Republic </p></bio><email xlink:type="simple">hnatic@saske.sk</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>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, главный научный сотрудник</p><p>ул. Сурганова, 11, 220072, 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-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Лаборатория информационных технологий имени М. Г. Мещерякова, Объединенный институт ядерных исследований; Государственный университет «Дубна»; Национальная научная лаборатория имени А. И. Алиханяна</institution></aff><aff xml:lang="en"><institution>Meshcheryakov Laboratory of Information Technologies, Joint Institute for Nuclear Research; State University «Dubna»; A. I. Alikhanyan National Science Laboratory</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Лаборатория теоретической физики имени Н. Н. Боголюбова, Объединенный институт ядерных исследований; Институт экспериментальной физики Словацкой академии наук; Факультет естествознания, Университет Павла Йозефа Шафарика</institution></aff><aff xml:lang="en"><institution>Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research; Institute of Experimental Physics, Slovak academy of Sciences; Faculty of Sciences, P. J. Šafárik University in Košice</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><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><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>04</day><month>04</month><year>2022</year></pub-date><volume>58</volume><issue>1</issue><fpage>21</fpage><lpage>33</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Айрян Э.А., Гнатич М., Малютин В.Б., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Айрян Э.А., Гнатич М., Малютин В.Б.</copyright-holder><copyright-holder xml:lang="en">Ayryan E.A., Hnatic M., Malyutin V.B.</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/626">https://vestifm.belnauka.by/jour/article/view/626</self-uri><abstract><p>Для одношаговых случайных марковских процессов проводится сравнение операторного и комбинаторного методов, основанное на использовании функциональных интегралов. При комбинаторном подходе используется переход от стохастического дифференциального уравнения к функциональному интегралу, с помощью которого получено выражение для среднего размера популяции. При операторном подходе переход к функциональному интегралу осуществляется через операторы рождения и уничтожения. Показано, что средние значения, вычисленные с помощью функциональных интегралов, возникающих при комбинаторном и операторном подходах, совпадают.</p></abstract><trans-abstract xml:lang="en"><p>Herein, for one-step random Markov processes the comparison of the operator and combinatorial methods based on the use of functional integrals is performed. With the combinatorial approach, the transition from the stochastic differential equation to the functional integral is used. This allows us to obtain the expression for the mean population size in terms of the functional integral. With the operator approach, the transition to the functional integral is performed via the creation and annihilation operators. It is shown that the mean values calculated using the functional integrals arising in the combinatorial and operator approaches coincide.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>марковские случайные процессы</kwd><kwd>процессы рождения-гибели</kwd><kwd>одношаговые процессы</kwd><kwd>комбинаторный подход</kwd><kwd>операторный подход</kwd><kwd>средние значения</kwd><kwd>функциональные интегралы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>random Markov processes</kwd><kwd>birth-death processes</kwd><kwd>one-step processes</kwd><kwd>combinatorial approach</kwd><kwd>operator approach</kwd><kwd>mean values</kwd><kwd>functional integrals</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований в рамках научного проекта № Ф20МС-005.</funding-statement><funding-statement xml:lang="en">The research was carried out under the financial support of the Belarusian Republican Foundation for Fundamental Research within the framework of Project no. 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