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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">vestifm-64</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>СОПРЯЖЕННЫЕ ФУКЦИИ НА ОТРЕЗКЕ И СООТНОШЕНИЯ ДЛЯ ИХ НАИЛУЧШИХ РАВНОМЕРНЫХ ПОЛИНОМИАЛЬНЫХ ПРИБЛИЖЕНИЙ</article-title><trans-title-group xml:lang="en"><trans-title>CONJUGATE FUNCTIONS ON A SEGMENT AND RELATIONS FOR THEIR BEST UNIFORM POLYNOMIAL APPROXIMATIONS</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>Мисюк</surname><given-names>В. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Misiuk</surname><given-names>V. R.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пекарский</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Pekarskii</surname><given-names>A. A.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Гродненский государственный университет им. Я. Купалы, Гродно</institution></aff><aff xml:lang="en"><institution>Yanka Kupala State University of Grodno</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский государственный университет, Минск</institution></aff><aff xml:lang="en"><institution>Belarusian State University, Minsk</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>17</day><month>05</month><year>2016</year></pub-date><volume>0</volume><issue>2</issue><fpage>37</fpage><lpage>40</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мисюк В.Р., Пекарский А.А., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Мисюк В.Р., Пекарский А.А.</copyright-holder><copyright-holder xml:lang="en">Misiuk V.R., Pekarskii A.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://vestifm.belnauka.by/jour/article/view/64">https://vestifm.belnauka.by/jour/article/view/64</self-uri><abstract><p>В работе найдено соотношение между наилучшими равномерными полиномиальными приближениями функции, заданной на отрезке, и ее сопряженной, аналогичное соотношение в периодическом случае было получено С. Б. Стечкиным. Также доказано неравенство типа Сегё для производных алгебраического многочлена. </p></abstract><trans-abstract xml:lang="en"><p>A relation between the best polynomial approximations of the function assigned on a segment and the function conjugated to it is found. In the periodic case, a similar relation is obtained by S. B. Stechkin. The inequality of G. Szegö type is also proved for the derivatives of an algebraic polynomial.</p></trans-abstract></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Тиман А. Ф. Теория приближения функций действительного переменного. М., 1960.</mixed-citation><mixed-citation xml:lang="en">Тиман А. Ф. Теория приближения функций действительного переменного. М., 1960.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Гахов Ф. Д. Краевые задачи. 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