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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">10.18255/1818-1015-2016-5-515-528</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-385</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>Сингулярно возмущенная эллиптическая задача Дирихле с кратным корнем вырожденного уравнения</article-title><trans-title-group xml:lang="en"><trans-title>Singularly Perturbed Elliptic Dirichlet Problem with 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>д-р физ.-мат. наук, профессор кафедры математики физического факультета</p></bio><bio xml:lang="en"><p>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>Белошапко</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Beloshapko</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант</p></bio><bio xml:lang="en"><p>graduate student</p></bio><email xlink:type="simple">postvab@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет им. М.В. Ломоносова, Ленинские горы, д. 1, стр. 2, г. Москва, 119991 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University, GSP-1, 1-2 Leninskiye Gory, 119991, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>20</day><month>10</month><year>2016</year></pub-date><volume>23</volume><issue>5</issue><fpage>515</fpage><lpage>528</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бутузов В.Ф., Белошапко В.А., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Бутузов В.Ф., Белошапко В.А.</copyright-holder><copyright-holder xml:lang="en">Butuzov V.F., Beloshapko V.A.</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/385">https://www.mais-journal.ru/jour/article/view/385</self-uri><abstract><p>Рассматривается сингулярно возмущенная эллиптическая задача с граничными условиями Дирихле в случае кратного корня вырожденного уравнения. Построено и обосновано полное асимптотическое разложение решения задачи. Оно качественно отличается от известного разложения в случае, когда корень вырожденного уравнения – простой: асимптотическое разложение решения ведется по дробным степеням малого параметра, погранслойные переменные имеют другой масштаб, погранслойный ряд строится с помощью нестандартного алгоритма, пограничный слой вблизи границы области состоит из трех зон с различным поведением решения в разных зонах.</p></abstract><trans-abstract xml:lang="en"><p>A singularly perturbed elliptic problem with Dirichlet boundary conditions is considered in the case of multiple roots of the degenerate equation. A complete asymptotic expansion of the solution is constructed and justified. It is qualitatively different from the known expansion in the case where the root of the degenerate equation is simple: the asymptotic expansion of the solution being in fractional powers of the small parameter, boundary-layer variables have a different scale, boundary-layer series is constructed using a non-standard algorithm, the boundary layer in the vicinity of the domain boundary consists of three zones with different behavior of the solution in different zones.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сингулярно возмущенное эллиптическое уравнение</kwd><kwd>случай кратного корня вырожденного уравнения</kwd><kwd>асимптотическое разложение решения погранслойного типа</kwd><kwd>трехзонный пограничный слой</kwd></kwd-group><kwd-group xml:lang="en"><kwd>singularly perturbed elliptic equation</kwd><kwd>case of multiple root of the degenerate equation</kwd><kwd>asymptotic expansion of boundary layer type solution</kwd><kwd>three-band boundary layer</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">Васильева А. 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