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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">donstu</journal-id><journal-title-group><journal-title xml:lang="en">Advanced Engineering Research (Rostov-on-Don)</journal-title><trans-title-group xml:lang="ru"><trans-title>Advanced Engineering Research (Rostov-on-Don)</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2687-1653</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">donstu-684</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="en"><subject>PHYSICAL AND MATHEMATICAL SCIENCES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-МАТЕМАТИЧЕСКИЕ НАУКИ</subject></subj-group></article-categories><title-group><article-title>CLOSEDNESS EQUATION FOR BIORTHOGONAL SYSTEM OF FUNCTIONS</article-title><trans-title-group xml:lang="ru"><trans-title>УРАВНЕНИЕ ЗАМКНУТОСТИ  ДЛЯ БИОРТОГОНАЛЬНОЙ СИСТЕМЫ ФУНКЦИЙ</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>Базаренко</surname><given-names>Николай Андреевич</given-names></name><name name-style="western" xml:lang="en"><surname>Bazarenko</surname><given-names>Nikolay A.</given-names></name></name-alternatives><email xlink:type="simple">peshkhoev@rameer.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>Пешхоев</surname><given-names>Иса Мусаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Peshkhoyev</surname><given-names>Isa M.</given-names></name></name-alternatives><email xlink:type="simple">peshkhoev@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Донской государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Don State Technical University.</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2011</year></pub-date><pub-date pub-type="epub"><day>30</day><month>03</month><year>2011</year></pub-date><volume>11</volume><issue>1</issue><fpage>5</fpage><lpage>9</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Bazarenko N.A., Peshkhoyev I.M., 2011</copyright-statement><copyright-year>2011</copyright-year><copyright-holder xml:lang="ru">Базаренко Н.А., Пешхоев И.М.</copyright-holder><copyright-holder xml:lang="en">Bazarenko N.A., Peshkhoyev I.M.</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.vestnik-donstu.ru/jour/article/view/684">https://www.vestnik-donstu.ru/jour/article/view/684</self-uri><abstract><p>Closedness  equation for biorthogonal system of functions has been derived. Closed-loop function systems characteristics are defined. They allow to solve contact problems of elasticity theory for finite bodies – a rectangle, a circular plate, a cylinder of finite length, etc. </p></abstract><trans-abstract xml:lang="ru"><p>Получено уравнение замкнутости для биортогональной системы функций. Определены свойства замкнутых систем функций, позволяющие решать контактные задачи теории упругости для тел конечных размеров – прямоугольника, круглой плиты, цилиндров конечной длины и т.д.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнение замкнутости</kwd><kwd>однородные решения.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>closedness equation</kwd><kwd>homogeneous solutions.</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">Александров В.М. Контактная задача для прямоугольника со свободными от напряжений боковыми гранями / В.М. Александров, Н.А. 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