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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2023-67-2-95-100</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1116</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Специальные факторы в ограничениях неприводимых модулей специальной линейной и симплектической групп на подсистемные подгруппы с двумя простыми компонентами</article-title><trans-title-group xml:lang="en"><trans-title>Special factors in restrictions of irreducible modules of special linear and symplectic groups to subsystem subgroups with two simple components</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>Супруненко</surname><given-names>И. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Suprunenko</surname><given-names>I. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Супруненко Ирина Дмитриевна – д-р физ.-мат. наук. </p></bio><bio xml:lang="en"><p>Suprunenko Irina D. – D. Sc. (Physics and Mathematics).</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бусел</surname><given-names>Т. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Busel</surname><given-names>T. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бусел Татьяна Сергеевна – канд. физ.-мат. наук, науч.сотрудник</p><p>ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Busel Tatsiana S. – Ph. D. (Physics and Mathematics),Researcher</p><p>11, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">tbusel@gmail.com</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>Осиновская</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Osinovskaya</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Осиновская Анна Александровна – канд. физ.-мат. наук, науч. сотрудник</p><p>ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Osinovskaya Anna A. – Ph. D. (Physics and Mathematics),Researcher</p><p>11, Surganov Str., 220072, Minsk</p><p> </p></bio><email xlink:type="simple">anna@im.bas-net.by</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>Институт математики Национальной академии наук Беларуси</institution><country>Belarus</country></aff><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>07</day><month>05</month><year>2023</year></pub-date><volume>67</volume><issue>2</issue><fpage>95</fpage><lpage>100</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Супруненко И.Д., Бусел Т.С., Осиновская А.А., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Супруненко И.Д., Бусел Т.С., Осиновская А.А.</copyright-holder><copyright-holder xml:lang="en">Suprunenko I.D., Busel T.S., Osinovskaya A.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://doklady.belnauka.by/jour/article/view/1116">https://doklady.belnauka.by/jour/article/view/1116</self-uri><abstract><p>Рассматриваются ограничения неприводимых модулей специальной линейной и симплектической групп в нечетной характеристике p с большими относительно p старшими весами на подсистемную подгруппу H максимального ранга с двумя простыми компонентами H1 и H2. Найдена нижняя оценка числа композиционных факторов таких ограничений, которые являются p-большими для подгруппы H1 и не слишком малы для H2. На этой основе получены нижние оценки для числа блоков Жордана максимальной размерности у образов определенных унипотентных элементов в соответствующих представлениях рассматриваемых групп. </p></abstract><trans-abstract xml:lang="en"><p>The restrictions of irreducible modules of special linear and symplectic groups in an odd characteristic p with p-large highest weights to a subsystem subgroup H of maximal rank with two simple components H1 and H2 are considered. The lower estimate for the number of composition factors for such restrictions, which are p-large for the subgroup H1 and are not too small for H2, is found. The lower estimates of the number of Jordan blocks of maximal size for the images of certain unipotent elements in the corresponding representations of such groups are determined. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>алгебраическая группа</kwd><kwd>специальная линейная группа</kwd><kwd>симплектическая группа</kwd><kwd>неприводимое представление</kwd><kwd>ограничение представления</kwd><kwd>унипотентный элемент</kwd></kwd-group><kwd-group xml:lang="en"><kwd>algebraic group</kwd><kwd>special linear group</kwd><kwd>symplectic group</kwd><kwd>irreducible representation</kwd><kwd>restriction of a representation</kwd><kwd>unipotent element</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке БРФФИ (проект № Ф21-054).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Seitz, G. M. The maximal subgroups of classical algebraic groups / G. M. Seitz // Memoirs of the AMS. – 1987. – Vol. 67, N 365. https://doi.org/10.1090/memo/0365</mixed-citation><mixed-citation xml:lang="en">Seitz G. M. The maximal subgroups of classical algebraic groups. Memoirs of the American Mathematical Society, 1987, vol. 67, no. 365. https://doi.org/10.1090/memo/0365 100</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Testerman, D. M. Irreducible subgroups of exceptional algebraic groups / D. M. Testerman // Memoirs of the AMS. – 1988. – Vol. 75, N 390. https://doi.org/10.1090/memo/0390</mixed-citation><mixed-citation xml:lang="en">Testerman D. M. Irreducible subgroups of exceptional algebraic groups. Memoirs of the American Mathematical Society, 1988, vol. 75, no. 390. https://doi.org/10.1090/memo/0390</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Ghandour, S. Irreducible disconnected subgroups of exceptional algebraic groups / S. Ghandour // J. Algebra. – 2010. – Vol. 323, N 10. – P. 2671–2709. https://doi.org/10.1016/j.jalgebra.2010.02.018</mixed-citation><mixed-citation xml:lang="en">Ghandour S. Irreducible disconnected subgroups of exceptional algebraic groups. Journal of Algebra, 2010, vol. 323, no. 10, pp. 2671–2709. https://doi.org/10.1016/j.jalgebra.2010.02.018</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Irreducible almost simple subgroups of classical algebraic groups / T. Burness [et al.] // Memoirs of the AMS. – 2015. – Vol. 236, N 1114. https://doi.org/10.1090/memo/1114</mixed-citation><mixed-citation xml:lang="en">Burness T., Ghandour S., Marion C., Testerman D. Irreducible almost simple subgroups of classical algebraic groups. Memoirs of the American Mathematical Society, 2015, vol. 236, no. 1114. https://doi.org/10.1090/memo/1114</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Burness, T. Irreducible geometric subgroups of classical algebraic groups / T. Burness, S. Ghandour, D. Testerman // Memoirs of the AMS. – 2015. – Vol. 239, N 1130. https://doi.org/10.1090/memo/1130</mixed-citation><mixed-citation xml:lang="en">Burness T., Ghandour S., Testerman D. Irreducible geometric subgroups of classical algebraic groups. Memoirs of the American Mathematical Society, 2016, vol. 239, no. 1130. https://doi.org/10.1090/memo/1130</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Cavallin, M. A new family of irreducible subgroups of the orthogonal algebraic groups / M. Cavallin, D. M. Testerman // Trans. Amer. Math. Soc. Ser. B. – 2019. – Vol. 6, N 2. – P. 45–79. https://doi.org/10.1090/btran/28</mixed-citation><mixed-citation xml:lang="en">Cavallin M., Testerman D. A new family of irreducible subgroups of the orthogonal algebraic groups. Transactions of the American Mathematical Society, Series B, 2019, vol. 6, no. 2, pp. 45–79. https://doi.org/10.1090/btran/28</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Liebeck, M. Distinguished unipotent elements and multiplicity-free subgroups of simple algebraic groups / M. Liebeck, G. Seitz, D. Testerman // Pacific J. Mathematics. – 2015. – Vol. 279, N 1–2. – P. 357–382. https://doi.org/10.2140/ pjm.2015.279.357</mixed-citation><mixed-citation xml:lang="en">Liebeck M., Seitz G., Testerman D. Distinguished unipotent elements and multiplicity-free subgroups of simple algebraic groups. Pacific Journal of Mathematics, 2015, vol. 279, no. 1–2, pp. 357–382. https://doi.org/10.2140/pjm.2015.279.357</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Korhonen, M. Reductive overgroups of distinguished unipotent elements in simple algebraic groups: Ph. D. Thesis / M. Korhonen. – Lausanne, 2017. – 241 p. https://doi.org/10.5075/epfl-thesis-8362</mixed-citation><mixed-citation xml:lang="en">Korhonen M. Reductive overgroups of distinguished unipotent elements in simple algebraic groups. Ph. D. Thesis. Lausanne, 2017. 241 p. https://doi.org/10.5075/epfl-thesis-8362</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Lubeck, F. Small degree representations of finite Chevalley groups in defining characteristic / F. Lubeck // LMS J. Comput. Math. – 2001. – Vol. 4. – P. 135–169. https://doi.org/10.1112/S1461157000000838</mixed-citation><mixed-citation xml:lang="en">Lubeck F. Small degree representations of finite Chevalley groups in defining characteristic. LMS Journal of Computation and Mathematics, 2001, vol. 4, pp. 135–169. https://doi.org/10.1112/S1461157000000838</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Супруненко, И. Д. О поведении унипотентных элементов в представлениях классических групп с большими старшими весами / И. Д. Супруненко // Докл. Нац. акад. наук Беларуси. – 2005. – Т. 49, № 5. – С. 11–15.</mixed-citation><mixed-citation xml:lang="en">Suprunenko I. D. On the behaviour of unipotent elements in representations of classical groups with large highest weights. Doklady Natsional’noi akademii nauk Belarusi = Doklady of the National Academy of Sciences of Belarus, 2005, vol. 49, no. 5, pp. 11–15 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Suprunenko, I. D. Special composition factors in restrictions of representations of special linear and symplectic groups to subsystem subgroups with two simple components / I. D. Suprunenko // Тр. Ин-та математики. – 2018. – Т. 26, № 1. – С. 115–133.</mixed-citation><mixed-citation xml:lang="en">Suprunenko I. D. Special composition factors in restrictions of representations of special linear and symplectic groups to subsystem subgroups with two simple components. Trudy Instituta matematiki = Proceedings of the Institute of Mathematics, 2018, vol. 26, no. 1, pp. 115–133.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
