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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">10.29235/1561-8323-2018-62-1-13-17</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-484</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>К ИССЛЕДОВАНИЮ УСТОЙЧИВОСТИ ГРАДИЕНТНЫХ СИСТЕМ ВТОРЫМ МЕТОДОМ ЛЯПУНОВА</article-title><trans-title-group xml:lang="en"><trans-title>INVESTIGATION OF THE STABILITY OF GRADIENT SYSTEMS BY THE SECOND LYAPUNOV METHOD</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>Княжище</surname><given-names>Л. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Knyazhishche</surname><given-names>Leonid B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р физ.-мат. наук, гл. науч. сотрудник</p><p>ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>D. Sc. (Physics and Mathematics), Leading reseacher</p><p>11, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">klb@im.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук 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>2018</year></pub-date><pub-date pub-type="epub"><day>04</day><month>03</month><year>2018</year></pub-date><volume>62</volume><issue>1</issue><fpage>13</fpage><lpage>17</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Княжище Л.Б., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Княжище Л.Б.</copyright-holder><copyright-holder xml:lang="en">Knyazhishche L.B.</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/484">https://doklady.belnauka.by/jour/article/view/484</self-uri><abstract><p>В работе приведены новые достаточные условия наличия экстремума для функции многих переменных. На основе этих условий установлены новые признаки устойчивости и асимптотической устойчивости градиентных систем. </p></abstract><trans-abstract xml:lang="en"><p>In the article, new sufficient conditions of the extremum of the multivariable functions are shown. New sufficient tests of the stability and the asymptotic stability of gradient systems are stated. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>устойчивость</kwd><kwd>градиентные системы</kwd><kwd>экстремум</kwd><kwd>метод Ляпунова</kwd></kwd-group><kwd-group xml:lang="en"><kwd>stability</kwd><kwd>gradient systems</kwd><kwd>extremum</kwd><kwd>Lyapunov method</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">Гайшун, И. В. Условия устойчивости решений автономных вполне интегрируемых уравнений / И. В. Гайшун, Л. Б. 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