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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2024-68-3-188-195</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1190</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>Об одном усилении теоремы Массеры о существовании периодических решений линейных дифференциальных периодических систем</article-title><trans-title-group xml:lang="en"><trans-title>About one strengthening of the Massera’s existence theorem of periodic solutions of linear differential periodic systems</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>Деменчук</surname><given-names>А. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Demenchuk</surname><given-names>A. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Деменчук Александр Константинович – д-р физ.- мат. наук, профессор, гл. науч. Сотрудник</p><p>ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Demenchuk Aleksandr K. – D. Sc. (Physics and Mathematics), Professor, Chief Researcher</p><p>11, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">demenchuk@im.bas-net.by</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>Конюх</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Konuh</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Конюх Александр Владимирович – канд. физ.-мат. наук, доцент</p><p>пр. Партизанский, 26, 220070, Минск</p></bio><bio xml:lang="en"><p>Konuh Aleksandr V. – Ph. D. (Physics and Mathematics), Associate Professor</p><p>26, Partizanski Ave., 220070, Minsk</p></bio><email xlink:type="simple">al3128@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт математики НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Science of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский государственный экономический университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Economic University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>08</day><month>07</month><year>2024</year></pub-date><volume>68</volume><issue>3</issue><fpage>188</fpage><lpage>195</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Деменчук А.К., Конюх А.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Деменчук А.К., Конюх А.В.</copyright-holder><copyright-holder xml:lang="en">Demenchuk A.K., Konuh A.V.</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://doklady.belnauka.by/jour/article/view/1190">https://doklady.belnauka.by/jour/article/view/1190</self-uri><abstract><p>Согласно теореме Массеры обыкновенная дифференциальная линейная неоднородная периодическая система имеет периодическое решение с периодом, совпадающим с периодом системы, если и только если эта система имеет ограниченное решение. В работе вводится класс L вектор-функций, названных растущими медленнее линейной функции, содержащий класс B ограниченных вектор-функций в качестве собственного подкласса. Доказано, что приведенная выше теорема Массеры останется верной, если в ее формулировке ограниченное решение заменить решением, растущим медленнее линейной функции. Показано, что множество B в метрическом пространстве (L, distc ), где distc – метрика равномерной сходимости вектор-функций на отрезках, имеет первую категорию по Бэру, т. е. почти все в смысле категории вектор-функции пространства (L, distc ) не являются ограниченными, что показывает существенность полученного усиления теоремы Массеры.</p></abstract><trans-abstract xml:lang="en"><p>According to Massera’s theorem, an ordinary differential linear nonhomogeneous periodic system has a periodic solution with a period coinciding with that of the system if and only if this system has a bounded solution. We introduce the class L of vector functions called growing slower than a linear function. This class contains the class B of bounded vector functions in as its own subclass. It has been proved that Massera’s above-mentioned theorem will remain true if in its formulation a bounded solution is replaced by a slower growing solution than a linear function. It is shown that the set B in the metric space (L, distc ), where distc is the uniform convergence metric vector functions on intervals, has Baer’s first category, i. e. almost everything in the sense of the category of space vector functions (L, distc ) are not bounded. This fact shows the significance of the obtained strengthening of Massera’s theorem.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>линейная периодическая система</kwd><kwd>периодические решения</kwd><kwd>теорема Массеры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>linear periodic system</kwd><kwd>periodic solution</kwd><kwd>Massera’s theorem</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">Еругин, Н. П. Линейные системы обыкновенных дифференциальных уравнений с периодическими и квазипериодическими коэффициентами / Н. П. Еругин. – Минск, 1963. – 272 с.</mixed-citation><mixed-citation xml:lang="en">Erugin N. P. Linear ordinary differential systems with periodic and quasiperiodic coefficients. Minsk, 1963. 272 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Чезари, Л. 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