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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2016-3-248-258</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-339</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Асимптотика, устойчивость и область притяжения периодического решения сингулярно возмущённой параболической задачи с двукратным корнем вырожденного уравнения</article-title><trans-title-group xml:lang="en"><trans-title>Asymptotics, Stability and Region of Attraction of a Periodic Solution to a Singularly Perturbed Parabolic Problem in Case of a Multiple Root of the Degenerate Equation</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бутузов</surname><given-names>В. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Butuzov</surname><given-names>V. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119991, г. Москва, Ленинские горы, МГУ, д. 1, стр. 2, физический факультет, доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>119991, Moscow, Leninskie Gory, MSU, faculty of physics, Professor</p></bio><email xlink:type="simple">butuzov@phys.msu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нефедов</surname><given-names>Н. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Nefedov</surname><given-names>N. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119991, г. Москва, Ленинские горы, МГУ, д. 1, стр. 2, физический факультет,  доктор физ.-мат. наук, профессор,</p></bio><bio xml:lang="en"><p>119991, Moscow, Leninskie Gory, MSU, faculty of physics, Professor</p></bio><email xlink:type="simple">nefedov@phys.msu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Реке</surname><given-names>Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Recke</surname><given-names>L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>Professor</p></bio><email xlink:type="simple">recke@mathematik.hu-berlin.de</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шнайдер</surname><given-names>К. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Schneider</surname><given-names>K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>Professor</p></bio><email xlink:type="simple">schneider@wias-berlin.de</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет им. М.В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>HU Berlin, Institut fuЁr Mathematik, Rudower Chaussee, Berlin, Germany</institution><country>Германия</country></aff><aff xml:lang="en"><institution>HU Berlin, Institut fuЁr Mathematik, Rudower Chaussee, Berlin, Germany</institution><country>Germany</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Weierstrass Institute for Applied Analysis and Stochastics, Mohrenstr. 39, 10117 Berlin, Germany</institution><country>Германия</country></aff><aff xml:lang="en"><institution>Weierstrass Institute for Applied Analysis and Stochastics, Mohrenstr. 39, 10117 Berlin, German</institution><country>Germany</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>20</day><month>06</month><year>2016</year></pub-date><volume>23</volume><issue>3</issue><fpage>248</fpage><lpage>258</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бутузов В.Ф., Нефедов Н.Н., Реке Л., Шнайдер К.Р., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Бутузов В.Ф., Нефедов Н.Н., Реке Л., Шнайдер К.Р.</copyright-holder><copyright-holder xml:lang="en">Butuzov V.F., Nefedov N.N., Recke L., Schneider K.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.mais-journal.ru/jour/article/view/339">https://www.mais-journal.ru/jour/article/view/339</self-uri><abstract><p>Для сингулярно возмущённой параболической задачи с краевыми условиями Дирихле построено и обосновано асимптотическое разложение периодического по времени решения с пограничными слоями вблизи концов отрезка в случае, когда вырожденное уравнение имеет двукратный корень. Поведение решения в пограничных слоях и сам алгоритм построения асимптотики существенно отличаются от случая однократного корня вырожденного уравнения. Исследован также вопрос об устойчивости периодического решения и области его притяжения.</p></abstract><trans-abstract xml:lang="en"><p>For a singularly perturbed parabolic problem with Dirichlet conditions we prove the existence of a solution periodic in time and with boundary layers at both ends of the space interval in the case that the degenerate equation has a double root. We construct the corresponding asymptotic expansion in a small parameter. It turns out that the algorithm of the construction of the boundary layer functions and the behavior of the solution in the boundary layers essentially diﬀer from that ones in case of a simple root. We also investigate the stability of this solution and the corresponding region of attraction.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сингулярно возмущенные уравнения реакция-диффузия</kwd><kwd>асимптотические приближения</kwd><kwd>устойчивость по Ляпунову</kwd><kwd>периодические решения</kwd><kwd>пограничные слои</kwd><kwd>область притяжения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>singularly perturbed reaction-diﬀusion equation</kwd><kwd>asymptotic approximation</kwd><kwd>periodic solution</kwd><kwd>boundary layers</kwd><kwd>Lyapunov stability</kwd><kwd>region of attraction</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">A.B. Vasil’eva, V. F. Butuzov, Asymptotic methods in the theory of singular perturbations, in Russian, Vyss. Shkola, Moscow, 1990.</mixed-citation><mixed-citation xml:lang="en">A.B. Vasil’eva, V. F. 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