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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">mathnas</journal-id><journal-title-group><journal-title xml:lang="ru">Труды Института математики НАН Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Institute of Mathematics of the NAS of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1812-5093</issn><publisher><publisher-name>Институт математики НАН Беларуси</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mathnas-11</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>ДИФФЕРЕНЦИАЛЬНЫЕ УРАВНЕНИЯ, ДИНАМИЧЕСКИЕ СИСТЕМЫ И ОПТИМАЛЬНОЕ УПРАВЛЕНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>DIFFERENTIAL EQUATIONS, DYNAMIC SYSTEMS AND OPTIMAL CONTROL</subject></subj-group></article-categories><title-group><article-title>Полное описание непрерывных на прямой решений линейного функционального уравнения второго порядка с постоянными коэффициентами</article-title><trans-title-group xml:lang="en"><trans-title>A complete description of continuous on the real line solutions of the linear functional equation of the second order with constant coefficients</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>Карпук</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Karpuk</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">m.vasilitch@gmail.com</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>Худякова</surname><given-names>П. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Khudziakova</surname><given-names>P. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></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 Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>30</day><month>09</month><year>2024</year></pub-date><volume>32</volume><issue>1</issue><fpage>74</fpage><lpage>85</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Карпук М.В., Худякова П.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Карпук М.В., Худякова П.А.</copyright-holder><copyright-holder xml:lang="en">Karpuk M.V., Khudziakova P.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://mathnas.ejournal.by/jour/article/view/11">https://mathnas.ejournal.by/jour/article/view/11</self-uri><abstract><p>   В работе даны критерий существования и полное описание непрерывных на прямой решений линейного функционального уравнения f( f(x))+a f(x)+bx = 0 второго порядка с постоянными коэффициентами.</p></abstract><trans-abstract xml:lang="en"><p>   The paper provides an existence criterion and a complete description of continuos solutions f : R → R of the linear second-order functional equation f(f(x))+a f(x)+bx = 0 with constant coefficients.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>линейное функциональное уравнение</kwd><kwd>траекторный подход</kwd><kwd>одномерная динамика</kwd><kwd>линейные рекуррентные последовательности</kwd></kwd-group><kwd-group xml:lang="en"><kwd>linear functional equation</kwd><kwd>trajectory approach</kwd><kwd>one-dimensional dynamics</kwd><kwd>linear recurrent sequences</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в Институте математики НАН Беларуси по заданию 1.2.01 «Развитие конструктивных и асимптотических методов исследования сложных управляемых дифференциальных и дискретных систем» ГПНИ «Конвергенция–2025» (подпрограмма «Математические модели и методы»)</funding-statement><funding-statement xml:lang="en">The work was performed at the Institute of Mathematics of the National Academy of Sciences of Belarus on assignment 1.2.01 "Development of constructive and asymptotic methods for the study of complex controlled differential and discrete systems" GPNI Convergence-2025" (subprogram "Mathematical models and methods")</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Милнор Дж. 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