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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">37476</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2023-69-4-565-577</article-id><article-id pub-id-type="edn">ECEVOW</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 ellipticity of operators with shear mappings</article-title><trans-title-group xml:lang="ru"><trans-title>Об эллиптичности операторов со скручиваниями</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Boltachev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Болтачев</surname><given-names>А. В.</given-names></name></name-alternatives><email>boltachevandrew@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>565</fpage><lpage>577</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, Boltachev A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Болтачев А.В.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Boltachev A.V.</copyright-holder><copyright-holder xml:lang="ru">Болтачев А.В.</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/37476">https://journals.rudn.ru/CMFD/article/view/37476</self-uri><abstract xml:lang="en"><p>The nonlocal boundary value problems are considered, in which the main operator and the operators in the boundary conditions include the differential operators and twisting operators. The de nition of the trajectory symbols for this class of problems is given. We show that the elliptic problems de ne the Fredholm operators in the corresponding Sobolev spaces. The ellipticity condition of such nonlocal boundary value problem is given.</p></abstract><trans-abstract xml:lang="ru"><p>Рассматриваются нелокальные краевые задачи, в которых основной оператор и операторы граничных условий включают дифференциальные операторы и операторы скручивания. Дано определение траекторных символов для этого класса краевых задач. Показано, что эллиптические задачи определяют фредгольмовы операторы в соответствующих пространствах Соболева. Дано условие эллиптичности таких нелокальных краевых задач.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ellipticity</kwd><kwd>twisting operator</kwd><kwd>Fredholm operator</kwd><kwd>trajectory symbol</kwd><kwd>nonlocal boundary-value problem</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>эллиптичность</kwd><kwd>оператор скручивания</kwd><kwd>фредгольмов оператор</kwd><kwd>траекторный символ</kwd><kwd>нелокальная краевая задача</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The study was carried out with ﬁnancial support from the Russian Foundation for Basic Research within the framework of the scientiﬁc project 21-51-12006-NNIO.</funding-statement><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта 21-51-12006-ННИО.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Агранович М. C. 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