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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">10.22405/2226-8383-2024-25-1-127-137</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1681</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>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Обобщение теоремы Лежандра о трёх квадратах</article-title><trans-title-group xml:lang="en"><trans-title>generalisation of Legendre’s three-square theorem</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>Хафез</surname><given-names>Аль-Ассад</given-names></name><name name-style="western" xml:lang="en"><surname>Hafez</surname><given-names>Al-Assad</given-names></name></name-alternatives><email xlink:type="simple">1hbrh0@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет им. М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>24</day><month>04</month><year>2024</year></pub-date><volume>25</volume><issue>1</issue><fpage>127</fpage><lpage>137</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хафез А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Хафез А.</copyright-holder><copyright-holder xml:lang="en">Hafez 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/1681">https://www.chebsbornik.ru/jour/article/view/1681</self-uri><abstract><p>В данной работе представлено обобщение теоремы Лежандра о трех квадратах на представления двух натуральных чисел в виде сумм трех квадратов, для которых имеется общий квадрат.</p></abstract><trans-abstract xml:lang="en"><p>In this paper a generalisation of Legendre’s three-square theorem to representations of two positive integers as sums of three squares for which the first square of each representation is the same is presented.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Теорема Лежандра о трёх квадратах</kwd><kwd>принцип Хассе для систем двух квадратичных форм.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Legendre’s three-square theorem</kwd><kwd>Hasse’s Principle for systems of two quadratic forms.</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">Anthony Knapp. Advanced Algebra // Birkh¨auser Boston, 2006.</mixed-citation><mixed-citation xml:lang="en">Anthony, Knapp, 2006. “Advanced Algebra”, Birkh¨auser Boston.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Jean-Pierre Serre, A Course in Arithmetic // Springer Verlag, New York 1973.</mixed-citation><mixed-citation xml:lang="en">Jean-Pierre, Serre, 1973. “A Course in Arithmetic”, Springer Verlag, New York.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">В. 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