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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">22397</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2017-63-3-516-541</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>New Results</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Новые результаты</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">Partial Preservation of Frequencies and Floquet Exponents of Invariant Tori in the Reversible KAM Context 2</article-title><trans-title-group xml:lang="ru"><trans-title>Частичное сохранение частот и показателей Флоке инвариантных торов в обратимом контексте 2 теории КАМ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sevryuk</surname><given-names>M B</given-names></name><name xml:lang="ru"><surname>Севрюк</surname><given-names>Михаил Борисович</given-names></name></name-alternatives><email>sevryuk@mccme.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">V. L. Talroze Institute of Energy Problems of Chemical Physics of the Russia Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт энергетических проблем химической физики им. В. Л. Тальрозе РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2017-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2017</year></pub-date><volume>63</volume><issue>3</issue><issue-title xml:lang="en">Diﬀerential and Functional Diﬀerential Equations</issue-title><issue-title xml:lang="ru">Дифференциальные и функционально-дифференциальные уравнения</issue-title><fpage>516</fpage><lpage>541</lpage><history><date date-type="received" iso-8601-date="2019-12-06"><day>06</day><month>12</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/22397">https://journals.rudn.ru/CMFD/article/view/22397</self-uri><abstract xml:lang="en">We consider the persistence of smooth families of invariant tori in the reversible context 2 of KAM theory under various weak nondegeneracy conditions via Herman’s method. The reversible KAM context 2 refers to the situation where the dimension of the ﬁxed point manifold of the reversing involution is less than half the codimension of the invariant torus in question. The nondegeneracy conditions we employ ensure the preservation of any prescribed subsets of the frequencies of the unperturbed tori and of their Floquet exponents (the eigenvalues of the coeﬃcient matrix of the variational equation along the torus).</abstract><trans-abstract xml:lang="ru">С помощью метода Эрмана изучается сохранение гладких семейств инвариантных торов в обратимом контексте 2 теории КАМ при различных слабых условиях невырожденности. Обратимый контекст 2 - это ситуация, в которой размерность многообразия неподвижных точек обращающей инволюции меньше половины коразмерности рассматриваемого инвариантного тора. Используемые условия невырожденности гарантируют сохранение любых заранее выбранных подмножеств частот невозмущенных торов и их показателей Флоке (собственных чисел матрицы коэффициентов вариационного уравнения вдоль тора).</trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Бредон Г. Введение в теорию компактных групп преобразований. - М.: Наука, 1980.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Де ла Яве Р. Введение в КАМ-теорию. - Москва-Ижевск: Ин-т комп. иссл., 2003.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Коннер П., Флойд Э. Гладкие периодические отображения. - М.: Мир, 1969.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Марсден Дж., Мак-Кракен М. Бифуркация рождения цикла и ее приложения. - М.: Мир, 1980.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Мозер Ю. 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