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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">10.29235/1561-8323-2020-64-3-268-272</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-879</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>О системе Колмогорова с однородными нелинейностями четвертой степени</article-title><trans-title-group xml:lang="en"><trans-title>On the kolmogorov system with fourth-degree homogeneous nonlinearities</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>Садовский</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Sadovskii</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Садовский Антон Павлович – д-р физ.-мат. наук, профессор</p><p>пр. Независимости, 4, 220030, Минск </p></bio><bio xml:lang="en"><p>Sadovskii Anton Pavlovich – D. Sc. (Physics and Mathematics), Professor</p><p>4, Nezavisimosti Ave, 220030, Minsk </p></bio><email xlink:type="simple">sadovskii@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>08</day><month>07</month><year>2020</year></pub-date><volume>64</volume><issue>3</issue><fpage>268</fpage><lpage>272</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Садовский А.П., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Садовский А.П.</copyright-holder><copyright-holder xml:lang="en">Sadovskii A.P.</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/879">https://doklady.belnauka.by/jour/article/view/879</self-uri><abstract><p>Необходимые условия центра для особой точки О (0, 0) для системы Колмогорова с однородными нелинейностями четвертой степени найдены в работе Б. Ференц, Ж. Джени, У. Лиу, В. Г. Романовского. Для всех этих случаев, за исключением двух, доказана и достаточность. В настоящей работе доказана достаточность для двух случаев центра, которые не были доказаны в упомянутой выше работе. Кроме того, другим способом доказана достаточность двух других условий центра.</p></abstract><trans-abstract xml:lang="en"><p>The necessary conditions of the center at the singular point O (0, 0) for the kolmogorov system with fourth-degree homogeneous nonlinearities are found in the work of B. Ferenc, J. Dzheny, W. Liu, V. G. Romanovsky. For all these cases, with the exception of two, sufficiency is also proved. In the present article, sufficiency is proved for two cases of the center that were not proved in the above-mentioned work. In addition, the sufficiency of two other conditions of the center is proved in another way.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>система с однородными нелинейностями четвертой степени</kwd><kwd>центр</kwd><kwd>интегрирующий множитель</kwd><kwd>линейная алгебраическая система</kwd></kwd-group><kwd-group xml:lang="en"><kwd>system with homogeneous nonlinearities of the fourth degree</kwd><kwd>center</kwd><kwd>integrating factor</kwd><kwd>linear algebraic system</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">Integrability Conditions for Lotka–Volterra Planar Complex Quartic Systems Hoving Homogeneous Nonlinearities / B. Ferčec [et al.] // Acta Appl. Math. – 2013. – Vol. 124, N 1. – P. 107–122. https://doi.org/10.1007/s10440-012-9772-5</mixed-citation><mixed-citation xml:lang="en">Ferčec B., Gine J., Liu y., Romanovski V. G. 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