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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">10.22405/2226-8383-2022-23-3-249-254</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1360</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>О трёхмерных сетках Смоляка III</article-title><trans-title-group xml:lang="en"><trans-title>About three-dimensional nets of Smolyak III</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>Добровольский</surname><given-names>Николай Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrovol’skii</surname><given-names>Nikolai Nikolaevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">nikolai.dobrovolsky@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>Горбачёв</surname><given-names>Дмитрий Викторович</given-names></name><name name-style="western" xml:lang="en"><surname>Gorbachev</surname><given-names>Dmitry Viktorovich</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-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иванов</surname><given-names>Валерий Иванович</given-names></name><name name-style="western" xml:lang="en"><surname>Ivanov</surname><given-names>Valerii Ivanovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">ivaleryi@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тульский государственный университет, Тульский государственный педагогический университет&#13;
им. Л. Н. Толстого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State University, Tula State Lev Tolstoy Pedagogical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Тульский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State&#13;
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>31</day><month>12</month><year>2022</year></pub-date><volume>23</volume><issue>3</issue><fpage>249</fpage><lpage>254</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Добровольский Н.Н., Горбачёв Д.В., Иванов В.И., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Добровольский Н.Н., Горбачёв Д.В., Иванов В.И.</copyright-holder><copyright-holder xml:lang="en">Dobrovol’skii N.N., Gorbachev D.V., Ivanov V.I.</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/1360">https://www.chebsbornik.ru/jour/article/view/1360</self-uri><abstract><p>Это третья статья из серии, посвящённой сеткам Смоляка. Работа относится к аналитической теории чисел и в ней рассматриваются вопросы приложения теории чисел к задачам приближенного анализа.В работе показано, что:1. линейный оператор 𝐴𝑞 взвешенных сеточных средних по сетке Смоляка при размер-ности 𝑠 &gt; 3 не является нормальным;2. найдены значения некоторых тригонометрических сумм 𝑆𝑞(𝑚1, . . . ,𝑚𝑠) сетки Смоляка при размерности 𝑠 &gt;= 3.</p></abstract><trans-abstract xml:lang="en"><p>This is the third article in a series dedicated to Smolyak grids. The work relates to analytical number theory and it deals with the application of number theory to problems of approximate analysis.The paper shows that:1. the linear operator 𝐴𝑞 of weighted grid averages over the Smolyak grid at dimension 𝑠 &gt; 3is not normal;2. found the values of some trigonometric sums 𝑆𝑞(𝑚1, . . . ,𝑚𝑠) of the resin grid at the dimension 𝑠 &gt;= 3.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сетки Смоляка</kwd><kwd>квадратурные формулы с сетками Смоляка</kwd><kwd>интерпо- ляционные формулы с сетками Смоляка.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>grid Smolyak</kwd><kwd>quadrature formulas with grids of Smolyak</kwd><kwd>interpolation formula with grids of Smolyak.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта №19-41-710005 _р_а. Исследование выполнено за счет гранта правительства Тульской области (договор № ДС/306 от 16.11.2021</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">Добровольский Н. М., Есаян А. Р., Яфаева Р. Р. О сетках С. А. Смоляка // Современные</mixed-citation><mixed-citation xml:lang="en">Dobrovol’skii, N. M., Esayan, А.R. &amp; Yafaeva, R. R. 2002, “On grids of Smolyak S. A.” ,</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">проблемы математики, механики, информатики: Тезисы докладов Всероссийской науч-</mixed-citation><mixed-citation xml:lang="en">Sovremennye problemy matematiki, mekhaniki, informatiki: Tezisy dokladov Vserossijskoj</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">ной конференции. 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