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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">10.29235/1561-8323-2025-69-2-95-100</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1240</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>Рациональные выражения для кратных корней полиномов</article-title><trans-title-group xml:lang="en"><trans-title>Rational expressions for multiple roots of polynomials</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>Чернявский</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Chernyavsky</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чернявский Михаил Михайлович – ст. преподаватель</p><p>пр-т Московский, 33, 210038, Витебск</p></bio><bio xml:lang="en"><p>Chernyavsky Mikhail M. – Lecturer</p><p>33, Moskovskiy Ave., 210038, Vitebsk</p></bio><email xlink:type="simple">misha360ff@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Витебский государственный университет имени П. М. Машерова</institution></aff><aff xml:lang="en"><institution>Vitebsk StateUniversity named after P. M. Masherov</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>06</day><month>05</month><year>2025</year></pub-date><volume>69</volume><issue>2</issue><fpage>95</fpage><lpage>100</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Чернявский М.М., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Чернявский М.М.</copyright-holder><copyright-holder xml:lang="en">Chernyavsky M.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://doklady.belnauka.by/jour/article/view/1240">https://doklady.belnauka.by/jour/article/view/1240</self-uri><abstract><p>Для многочленов f, обладающих кратными корнями, получены явные формулы для высших производных от результантов R(f, f (k)) (f (k) – производная порядка k). На этой базе доказаны существенно отличающиеся от известных результатов утверждения, связывающие высшие производные результантов и кратные корни.</p></abstract><trans-abstract xml:lang="en"><p>For polynomials possessing multiple roots we deduce explicit formulas for higher derivatives of resultants R(f, f (k)) (f (k) is a derivative of order k). On this basis a number of results linking higher derivatives of resultants and multiple roots of polynomials that differ in ideas from the well-known ones are obtained.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>корень полинома</kwd><kwd>результант</kwd><kwd>кратные корни</kwd><kwd>явные формулы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>root of a polynomial</kwd><kwd>resultant</kwd><kwd>multiple roots</kwd><kwd>exact formulas</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (проект Ф23М-003).</funding-statement><funding-statement xml:lang="en">The study was carried out with financial support from the Belarusian Republican Foundation for Fundamental Research (project Ф23М-003).</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">Gelfand, I. 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