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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">10.22405/2226-8383-2022-23-4-157-161</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1384</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>Краткие сообщения</subject></subj-group></article-categories><title-group><article-title>Задача Дельсарта для 4-дизайнов на единичной 3-сфере</article-title><trans-title-group xml:lang="en"><trans-title>Delsarte problem for 4-designs on the unit 3-sphere</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>Горбачев</surname><given-names>Дмитрий Викторович</given-names></name><name name-style="western" xml:lang="en"><surname>Gorbachev</surname><given-names>Dmitriy Victorovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences</p></bio><email xlink:type="simple">dvgmail@mail.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>Мартьянов</surname><given-names>Иван Анатольевич</given-names></name><name name-style="western" xml:lang="en"><surname>Martyanov</surname><given-names>Ivan Anatol’evich</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">martyanow.ivan@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тульский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>16</day><month>01</month><year>2023</year></pub-date><volume>23</volume><issue>4</issue><fpage>157</fpage><lpage>161</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Горбачев Д.В., Мартьянов И.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Горбачев Д.В., Мартьянов И.А.</copyright-holder><copyright-holder xml:lang="en">Gorbachev D.V., Martyanov I.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.chebsbornik.ru/jour/article/view/1384">https://www.chebsbornik.ru/jour/article/view/1384</self-uri><abstract><p>Экстремальная задача Дельсарта 𝐴(𝑑, 𝑠) для сферических 𝑠-дизайнов позволяет оценить снизу минимальной число узлов 𝑁(𝑑, 𝑠) взвешенной квадратурной формулы на сфере S𝑑. Мы доказываем, что 𝐴(3, 4) = 14.560317967882 . . . .Отсюда 𝑁(3, 4) &gt; 15. Наша открытая гипотеза состоит в том, что 𝑁(3, 4) = 16.</p></abstract><trans-abstract xml:lang="en"><p>The extremal Delsarte problem 𝐴(𝑑, 𝑠) for spherical 𝑠-designs allows us to estimate from below the minimum number of nodes 𝑁(𝑑, 𝑠) of a weighted quadrature formula on the sphere S𝑑.We prove that 𝐴(3, 4) = 14.560317967882 . . . .Hence 𝑁(3, 4) &gt; 15. Our open conjecture is that 𝑁(3, 4) = 16.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>единичная сфера</kwd><kwd>сферический дизайн</kwd><kwd>квадратурная формула</kwd><kwd>зада- ча Дельсарта.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>unit sphere</kwd><kwd>spherical design</kwd><kwd>quadrature formula</kwd><kwd>Delsarte problem.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 18-11-00199, https://rscf.ru/ project/18-11-00199/.</funding-statement><funding-statement xml:lang="en">This Research was performed by a grant of Russian Science Foundation (project 18-11-00199), https://rscf. ru/project/18-11-00199/.</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">Мартьянов И.А. Решение задачи Дельсарта для 4-дизайнов на сфере 𝑆2 // Чебышевский</mixed-citation><mixed-citation xml:lang="en">Martyanov, I.A. 2021. “Solving the Delsarte problem for 4-designs on the sphere 𝑆2”, Chebyshevskii</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">сборник. 2021. Том 22, № 3. С. 154–165.</mixed-citation><mixed-citation xml:lang="en">Sbornik, vol. 22, no. 3, pp. 154–165. (In Russ.)</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>
