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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">izvuzmath</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3446</issn><issn pub-type="epub">2076-4626</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/0021-3446-2025-9-25-37</article-id><article-id custom-type="elpub" pub-id-type="custom">izvuzmath-218</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></article-categories><title-group><article-title>Тождества для рядов Эйзенштейна уровня 20 и их комбинаторные свойства</article-title><trans-title-group xml:lang="en"><trans-title>Level 20 Eisenstein series identities and their combinatorial properties</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>Винай</surname><given-names>Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Vinay</surname><given-names>G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Г. ВинайБангалор, 560056, Индия</p></bio><bio xml:lang="en"><p>G. VinayBengaluru, 560056</p></bio><email xlink:type="simple">vinaytalakad@gmail.com</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>Сиддараджу</surname><given-names>.</given-names></name><name name-style="western" xml:lang="en"><surname>Siddaraju</surname><given-names>.</given-names></name></name-alternatives><bio xml:lang="ru"><p>СиддараджуЧамараджанагар, 571313, Индия</p></bio><bio xml:lang="en"><p>SiddarajuChamarajanagara, 571313</p></bio><email xlink:type="simple">siddupalya73@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>Шивакумар Свами</surname><given-names>К.С.</given-names></name><name name-style="western" xml:lang="en"><surname>Shivakumar Swamy</surname><given-names>C.S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>К.С. Шивакумар СвамиМандья, 571401, Индия</p></bio><bio xml:lang="en"><p>C.S. Shivakumar SwamyMandya, 571401</p></bio><email xlink:type="simple">cskswamy@gmail.com</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Технологический институт им. доктора Амбедкара</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Dr. Ambedkar Institute of Technology</institution><country>India</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Государственный женский колледж первого уровня</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Government First Grade College for Women</institution><country>India</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Государственный женский колледж (автономный)</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Government College for Women (Autonomous)</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>11</day><month>10</month><year>2025</year></pub-date><volume>1</volume><issue>9</issue><fpage>25</fpage><lpage>37</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Винай Г., Сиддараджу .., Шивакумар Свами К., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Винай Г., Сиддараджу .., Шивакумар Свами К.</copyright-holder><copyright-holder xml:lang="en">Vinay G., Siddaraju .., Shivakumar Swamy C.</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://izvuzmath.elpub.ru/jour/article/view/218">https://izvuzmath.elpub.ru/jour/article/view/218</self-uri><abstract><p>Т. Хубер, Д. Шульц и Д. Йе получили четыре тождества для рядов Эйзенштейна уровня 20 и использовали их для вывода нового разложения для 1π. Как продолжение этих результатов в данной статье получены девять новых тождеств для рядов Эйзенштейна уровня 20 и установлены их комбинаторные свойства.</p></abstract><trans-abstract xml:lang="en"><p>T. Huber, D. Schultz and D. Ye have obtained four Eisenstein series identities of level 20 and employed them to derive a new series for 1 \pi . Motivated by this, in this article, nine new Eisenstein series identities of level 20 are presented and their combinatorial properties are given. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>тета-функция</kwd><kwd>модулярное уравнение</kwd><kwd>ряд Эйзенштейна</kwd></kwd-group><kwd-group xml:lang="en"><kwd>theta function</kwd><kwd>modular equation</kwd><kwd>Eisenstein series</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">Whittaker E.T., Watson G.N. A course of modern analysis (Cambridge Univ. Press, 1962).</mixed-citation><mixed-citation xml:lang="en">Whittaker E.T., Watson G.N. A course of modern analysis (Cambridge Univ. Press, 1962).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Huber T., Schultz D., Ye D. "Series for 1/π of level 20", J. 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