<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">10.22405/2226-8383-2021-22-3-464-466</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1106</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>Лемма Болла в качестве упражнения</article-title><trans-title-group xml:lang="en"><trans-title>Ball’s lemma as an exercise</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>Лифлянд</surname><given-names>Илья Рафаилович</given-names></name><name name-style="western" xml:lang="en"><surname>Liflyand</surname><given-names>Elijah Rafailovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>факультет математики</p></bio><bio xml:lang="en"><p>department of mathematics</p></bio><email xlink:type="simple">liflyand@math.biu.ac.il</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет Бар-Илан</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Bar-Ilan University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>12</day><month>11</month><year>2021</year></pub-date><volume>22</volume><issue>3</issue><fpage>464</fpage><lpage>466</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лифлянд И.Р., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Лифлянд И.Р.</copyright-holder><copyright-holder xml:lang="en">Liflyand E.R.</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/1106">https://www.chebsbornik.ru/jour/article/view/1106</self-uri><abstract><p>Предложено очень короткое доказательство леммы Болла средствами исключительно гармонического анализа.</p></abstract><trans-abstract xml:lang="en"><p>We suggest an extremely short proof of Ball’s lemma by means of harmonic analysis only.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Лемма Болла</kwd><kwd>преобразование Фурье</kwd><kwd>неравенство Хаусдорфа-Янга</kwd><kwd>постоянная Бабенко-Бекнера.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Ball’s lemma</kwd><kwd>Fourier transform</kwd><kwd>Hausdorff-Young inequality</kwd><kwd>Babenko-Beckner constant.</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">К. И. Бабенко. Об одном неравенстве в теории интегралов Фурье // Изв. АН СССР. Сер.</mixed-citation><mixed-citation xml:lang="en">K. I. Babenko, 1961, "An inequality in the theory of Fourier integral" , Izv. Akad. Nauk SSSR</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">матем. 1961. т. 25, № 4, С. 531–542.</mixed-citation><mixed-citation xml:lang="en">Ser. Mat. vol. 25, 531–542 (Russian).</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">K. Ball. Cube slicing in 𝑅𝑛 // Proc. Amer. Math. Soc. 1986, vol. 97, P. 465–473.</mixed-citation><mixed-citation xml:lang="en">K. Ball, 1986, "Cube slicing in Rn" , Proc. Amer. Math. Soc. vol. 97, 465–473.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">W. Beckner. Inequalities in Fourier analysis // Ann. Math. 1975, vol. 102, P. 159–182.</mixed-citation><mixed-citation xml:lang="en">W. Beckner, 1975, "Inequalities in Fourier analysis" , Ann. Math. vol. 102, 159–182.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">S. Bochner. Lectures on Fourier Integrals // Princeton Univ. Press, Princeton, N. J. 1959.</mixed-citation><mixed-citation xml:lang="en">S. Bochner, 1959. Lectures on Fourier Integrals, Princeton Univ. Press, Princeton, N. J.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">B. Makarov and A. Podkorytov. Real Analysis: Measures, Integrals and Applications //</mixed-citation><mixed-citation xml:lang="en">B. Makarov and A. Podkorytov, 2013. Real Analysis: Measures, Integrals and Applications, Springer</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Springer, 2013.</mixed-citation><mixed-citation xml:lang="en">Springer, 2013.</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>
