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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">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mais-959</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>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Оценки оператора Кордобы - Фернандеса в пространствах Марцинкевича</article-title><trans-title-group xml:lang="en"><trans-title>Estimates of the Cordoba - Fernandez operator in Marcinkiewicz spaces</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>Бережной</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Berezhnoi</surname><given-names>Y. I.</given-names></name></name-alternatives><email xlink:type="simple">ber@uniyar.ac.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>Гладких</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Gladkikh</surname><given-names>D. S.</given-names></name></name-alternatives><email xlink:type="simple">dgladkikh@uniyar.ac.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>Ярославский государственный университет им. П.Г. Демидова</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2009</year></pub-date><pub-date pub-type="epub"><day>20</day><month>12</month><year>2009</year></pub-date><volume>16</volume><issue>4</issue><fpage>34</fpage><lpage>45</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бережной Е.И., Гладких Д.С., 2009</copyright-statement><copyright-year>2009</copyright-year><copyright-holder xml:lang="ru">Бережной Е.И., Гладких Д.С.</copyright-holder><copyright-holder xml:lang="en">Berezhnoi Y.I., Gladkikh D.S.</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.mais-journal.ru/jour/article/view/959">https://www.mais-journal.ru/jour/article/view/959</self-uri><abstract><p>В работах А. Кордобы и П. Фернандеса о расходимости жадных алгоритмов в пространствах Лебега ключевую роль играл некоторый максимальный оператор Pn**(x). В настоящей статье рассмотрены оценки P*(x) в пространствах Марцинкевича.</p></abstract><trans-abstract xml:lang="en"><p>In the A. Cordoba and P. Fernandez research of the divergence of greedy algorithms in Lebesgue spaces some maximum operator P*(x) played the key role. This article reviews the assessment P*(x) in Marcinkiewicz spaces.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>жадные алгоритмы</kwd><kwd>пространство Марцинкевича</kwd><kwd>оценки  операторов</kwd></kwd-group><kwd-group xml:lang="en"><kwd>greedy algorithms</kwd><kwd>Marcinkiewicz space</kwd><kwd>estimate of operators</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">Крейн С. Г., Петунии Ю. И., Семенов Е. М. 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