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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">41140</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2024-70-3-403-416</article-id><article-id pub-id-type="edn">PSBLYU</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">On two methods of determining η-invariants of elliptic boundaryvalue problems</article-title><trans-title-group xml:lang="ru"><trans-title>О двух способах определения η-инвариантов эллиптических краевых задач</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zhuikov</surname><given-names>K. N.</given-names></name><name xml:lang="ru"><surname>Жуйков</surname><given-names>К. Н.</given-names></name></name-alternatives><email>zhuykovcon@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Savin</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Савин</surname><given-names>А. Ю.</given-names></name></name-alternatives><email>a.yu.savin@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-10-15" publication-format="electronic"><day>15</day><month>10</month><year>2024</year></pub-date><volume>70</volume><issue>3</issue><issue-title xml:lang="en">VOL 70, NO3 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 70, №3 (2024)</issue-title><fpage>403</fpage><lpage>416</lpage><history><date date-type="received" iso-8601-date="2024-10-15"><day>15</day><month>10</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Zhuikov K.N., Savin A.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Жуйков К.Н., Савин А.Ю.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Zhuikov K.N., Savin A.Y.</copyright-holder><copyright-holder xml:lang="ru">Жуйков К.Н., Савин А.Ю.</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/41140">https://journals.rudn.ru/CMFD/article/view/41140</self-uri><abstract xml:lang="en"><p style="text-align: justify;">For a class of boundary-value problems with a parameter that are elliptic in the sense of Agranovich-Vishik, we establish the equality of the η-invariant defined in terms of the Melrose regularization and the spectral η-invariant of the Atiyah-Patodi-Singer type defined using the analytic continuation of the spectral η-function of the operator.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Для класса краевых задач с параметром, эллиптических в смысле Аграновича-Вишика, установлено равенство η-инварианта, определяемого в терминах регуляризации Мельроуза, и спектрального η-инварианта типа Атьи-Патоди-Зингера, определяемого при помощи аналитического продолжения спектральной η-функции оператора.</p></trans-abstract><kwd-group xml:lang="en"><kwd>elliptic boundary-value problems with a parameter</kwd><kwd>η-invariants</kwd><kwd>spectral invariants</kwd><kwd>regularized traces</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>эллиптические краевые задачи с параметром</kwd><kwd>η-инварианты</kwd><kwd>спектральные инварианты</kwd><kwd>регуляризованные следы</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The study was supported by a grant from the Russian Science Foundation No. 24-21-00336.</funding-statement><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 24-21-00336.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Агранович М.С., Вишик М.И. 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