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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">mathnas</journal-id><journal-title-group><journal-title xml:lang="ru">Труды Института математики НАН Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Institute of Mathematics of the NAS of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1812-5093</issn><publisher><publisher-name>Институт математики НАН Беларуси</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.67268/1812-5093-2026-34-1-118-124</article-id><article-id custom-type="edn" pub-id-type="custom">PBYKZA</article-id><article-id custom-type="elpub" pub-id-type="custom">mathnas-144</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>ТЕОРИЯ ВЕРОЯТНОСТЕЙ И МАТЕМАТИЧЕСКАЯ СТАТИСТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PROBABILITY THEORY AND MATHEMATICAL STATISTICS</subject></subj-group></article-categories><title-group><article-title>Подробное доказательство условия эргодичности для многолинейной системы массового обслуживания с неоднородными приборами и распределением времени обслуживания фазового типа</article-title><trans-title-group xml:lang="en"><trans-title>Detailed proof of ergodicity condition for the multi-server retrial queueing system with heterogeneous servers and phase type distribution of service</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>Лю</surname><given-names>Мэй</given-names></name><name name-style="western" xml:lang="en"><surname>Liu</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">liumei19910101@126.com</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>Дудин</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Dudin</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">dudin@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>30</day><month>06</month><year>2026</year></pub-date><volume>34</volume><issue>1</issue><fpage>118</fpage><lpage>124</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лю М., Дудин А.Н., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Лю М., Дудин А.Н.</copyright-holder><copyright-holder xml:lang="en">Liu M., Dudin A.N.</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://mathnas.ejournal.by/jour/article/view/144">https://mathnas.ejournal.by/jour/article/view/144</self-uri><abstract><p>Представлено подробное доказательство условия эргодичности для многолинейной системы массового обслуживания с повторными попытками, неоднородными приборами, временем обслуживания, имеющим фазовое распределение с различными неприводимыми представлениями, и поступлением запросов, определяемым марковским процессом поступления. Доказательство состоит в использовании асимптотически квазитеплицевых цепей Маркова и теории марковских процессов обновления.</p></abstract><trans-abstract xml:lang="en"><p>Detailed proof of ergodicity for a multi-server retrial queueing system with heterogeneous servers, service times having a phase-type distribution with different irreducible representations and customer arrival defined by a Markovian arrival process is given. The proof consists of the use of the asymptotically quasi-Toeplitz Markov chains and Markov renewal processes theory</p></trans-abstract><kwd-group xml:lang="ru"><kwd>марковский процесс поступления</kwd><kwd>повторные попытки</kwd><kwd>неоднородные серверы</kwd><kwd>распределение фазового типа</kwd><kwd>асимптотически квазитеплицевы цепи Маркова</kwd><kwd>эргодичность.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Markovian arrival process</kwd><kwd>retrials</kwd><kwd>heterogeneous servers</kwd><kwd>phase-type distribution</kwd><kwd>asymptotically quasi-Toeplitz Markov chains</kwd><kwd>ergodicity.</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">Liu M., Dudin A. N. Steady-state analysis of the multi-server retrial queueing system with heterogeneous servers and phase type distribution of service times. 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