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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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2021-22-5-44-57</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1159</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>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Реализация фокусных особенностей интегрируемых систем биллиардными книжками с потенциалом Гука</article-title><trans-title-group xml:lang="en"><trans-title>Realization of focal singularities of integrable systems using billiard books with a Hooke potential field</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>Ведюшкина</surname><given-names>Виктория Викторовна</given-names></name><name name-style="western" xml:lang="en"><surname>Vedyushkina</surname><given-names>Victoria Viktorovna</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук</p></bio><bio xml:lang="en"><p>doctor of physics and mathematics</p></bio><email xlink:type="simple">arinir@yandex.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>Кибкало</surname><given-names>Владислав Александрович</given-names></name><name name-style="western" xml:lang="en"><surname>Kibkalo</surname><given-names>Vladislav Alexandrovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physics and mathematics</p></bio><email xlink:type="simple">slava.kibkalo@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>Пустовойтов</surname><given-names>Сергей Евгеньевич</given-names></name><name name-style="western" xml:lang="en"><surname>Pustovoitov</surname><given-names>Sergey Evgenievich</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант</p></bio><bio xml:lang="en"><p>postgraduate student</p></bio><email xlink:type="simple">pustovoitovse1@mail.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 имени 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>Московский государственный университет имени М. В. Ломоносова; Московский центр фундаментальной и прикладной математики</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University; Moscow Center for Fundamental and Applied Mathematics</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>17</day><month>01</month><year>2022</year></pub-date><volume>22</volume><issue>5</issue><fpage>44</fpage><lpage>57</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ведюшкина В.В., Кибкало В.А., Пустовойтов С.Е., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Ведюшкина В.В., Кибкало В.А., Пустовойтов С.Е.</copyright-holder><copyright-holder xml:lang="en">Vedyushkina V.V., Kibkalo V.A., Pustovoitov S.E.</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.chebsbornik.ru/jour/article/view/1159">https://www.chebsbornik.ru/jour/article/view/1159</self-uri><abstract><p>Рассмотрены системы движения частицы в поле центрального потенциала Гука по биллиардной книжке, склеенной из плоских круговых биллиардов. Важный класс невырожденных фокусных особенностей ранга 0 интегрируемых систем с 2 степенями свободы полностью реализован таким классом биллиардов. А именно, для каждой полулокальной фокусной особенности была построена биллиардная система с особенностью, послойно гомеоморфной данной.</p></abstract><trans-abstract xml:lang="en"><p>Systems of particle motion in the Hooke central potential field on a billiard book glued from flat circular billiard domains are considered. An important class of nondegenerate focalsingularities of the rank 0 of integrable systems with 2 degrees of freedom is completely realized by this class of billiards. Namely, for each semi-local focal singularity the constructed billiard system has a singularity fiberwise homeomorphic to the given one.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>интегрируемый биллиард</kwd><kwd>фокусная особенность</kwd><kwd>слоение Лиувилля.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>integrable billiard</kwd><kwd>focal singularity</kwd><kwd>Liouville foliation.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке гранта РНФ 17-11-01303 в МГУ имени М. В. Ломоносова</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">Ведюшкина В.В., Фоменко А.Т., Бильярды и интегрируемость в геометрии и физике. Новый взгляд и новые возможности // Вестн. Моск. Унив., Серия Мат. и Мех. 2019. №3. 15–25.</mixed-citation><mixed-citation xml:lang="en">A. T. Fomenko, V. V. 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