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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">33498</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2022-68-4-686-703</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Numerical analysis of stationary solutions of systems with delayed argument in mathematical immunology</article-title><trans-title-group xml:lang="ru"><trans-title>Численный анализ стационарных решений систем с запаздывающим аргументом в математической иммунологии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khristichenko</surname><given-names>M. Yu.</given-names></name><name xml:lang="ru"><surname>Христиченко</surname><given-names>М. Ю.</given-names></name></name-alternatives><email>misha.hrist@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nechepurenko</surname><given-names>Yu. M.</given-names></name><name xml:lang="ru"><surname>Нечепуренко</surname><given-names>Ю. М.</given-names></name></name-alternatives><email>yumnech@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Grebennikov</surname><given-names>D. S.</given-names></name><name xml:lang="ru"><surname>Гребенников</surname><given-names>Д. С.</given-names></name></name-alternatives><email>dmitry.ew@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bocharov</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Бочаров</surname><given-names>Г. А.</given-names></name></name-alternatives><email>gbocharov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Marchuk Institute of Numerical Mathematics of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт вычислительной математики им. Г. И. Марчука РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2022</year></pub-date><volume>68</volume><issue>4</issue><issue-title xml:lang="en">VOL 68, NO4 (2022)</issue-title><issue-title xml:lang="ru">ТОМ 68, №4 (2022)</issue-title><fpage>686</fpage><lpage>703</lpage><history><date date-type="received" iso-8601-date="2023-02-06"><day>06</day><month>02</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Khristichenko M.Y., Nechepurenko Y.M., Grebennikov D.S., Bocharov G.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Христиченко М.Ю., Нечепуренко Ю.М., Гребенников Д.С., Бочаров Г.А.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Khristichenko M.Y., Nechepurenko Y.M., Grebennikov D.S., Bocharov G.A.</copyright-holder><copyright-holder xml:lang="ru">Христиченко М.Ю., Нечепуренко Ю.М., Гребенников Д.С., Бочаров Г.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/33498">https://journals.rudn.ru/CMFD/article/view/33498</self-uri><abstract xml:lang="en"><p style="text-align: justify;">This work is devoted to the technology developed by the authors that allows one for fixed values of parameters and tracing by parameters to calculate stationary solutions of systems with delay and analyze their stability. We discuss the results of applying this technology to Marchuk-Petrov's antiviral immune response model with parameter values corresponding to hepatitis B infection. The presence of bistability and hysteresis properties in this model is shown for the first time.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Данная работа посвящена разработанной авторами технологии вычисления при фиксированных значениях параметров и трассирования по параметрам стационарных решений систем с запаздыванием и анализа их устойчивости. Обсуждаются результаты применения этой технологии к модели противовирусного иммунного ответа Марчука-Петрова со значениями параметров, соответствующими инфекции гепатита В. Впервые показано наличие свойств бистабильности и гистерезиса в данной модели.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Marchuk-Petrov’s antiviral immune response model</kwd><kwd>delayed argument</kwd><kwd>stationary solutions</kwd><kwd>tracing by parameters</kwd><kwd>numerical experiment</kwd><kwd>hepatitis B infection</kwd><kwd>bistability</kwd><kwd>hysteresis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>модель противовирусного иммунного ответа Марчука</kwd><kwd>Петрова</kwd><kwd>запаздывающий аргумент</kwd><kwd>стационарные решения</kwd><kwd>трассирование по параметрам</kwd><kwd>численное моделирование</kwd><kwd>инфекция гепатита В</kwd><kwd>бистабильность</kwd><kwd>гистерезис</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Марчук Г. И. Избранные труды: Т. 4. 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