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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">37479</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2023-69-4-599-620</article-id><article-id pub-id-type="edn">YQAARE</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">Eta-invariant of elliptic parameter-dependent boundary-value problems</article-title><trans-title-group xml:lang="ru"><trans-title>Эта-инвариант эллиптических краевых задач с параметром</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="2023-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2023</year></pub-date><volume>69</volume><issue>4</issue><issue-title xml:lang="en">VOL 69, NO4 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 69, №4 (2023)</issue-title><fpage>599</fpage><lpage>620</lpage><history><date date-type="received" iso-8601-date="2024-01-18"><day>18</day><month>01</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Zhuikov K.N., Savin A.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Жуйков К.Н., Савин А.Ю.</copyright-statement><copyright-year>2023</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/37479">https://journals.rudn.ru/CMFD/article/view/37479</self-uri><abstract xml:lang="en"><p>In this paper, we study the eta-invariant of elliptic parameter-dependent boundary value problems and its main properties. Using Melrose’s approach, we de ne the eta-invariant as a regularization of the winding number of the family. In this case, the regularization of the trace requires obtaining the asymptotics of the trace of compositions of invertible parameter-dependent boundary value problems for large values of the parameter. Obtaining the asymptotics uses the apparatus of pseudodifferential boundary value problems and is based on the reduction of parameter-dependent boundary value problems to boundary value problems with no parameter.</p></abstract><trans-abstract xml:lang="ru"><p>В работе исследуется эта-инвариант эллиптических краевых задач с параметром и его основные свойства. Используя подход Мельроуза, мы определяем эта-инвариант как регуляризацию числа вращения семейства. При этом регуляризация следа включает получение асимптотики следа композиций обратимых краевых задач с параметром при больших значениях параметра. Получение асимптотики использует аппарат псевдодифференциальных краевых задач и опирается на сведение краевых задач с параметром к краевым задачам без параметра.</p></trans-abstract><kwd-group xml:lang="en"><kwd>eta-invariant</kwd><kwd>elliptic parameter-dependent boundary value problem</kwd><kwd>pseudodi erential boundary value problem</kwd><kwd>Boutet de Monvel operator</kwd><kwd>regularized trace</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>эта-инвариант</kwd><kwd>эллиптическая краевая задача с параметром</kwd><kwd>псевдодифференциальная краевая задача</kwd><kwd>оператор Буте де Монвеля</kwd><kwd>регуляризованный след</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported in part by the Young Russian Mathematics award and by RFBR and DFG, project No. 21-51-12006.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при частичной финансовой поддержке конкурса «Молодая математика России» и РФФИ, проект № 21-51-12006.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Агранович М. 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