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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 custom-type="elpub" pub-id-type="custom">dan-327</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>РЕКУРСИВНОЕ ПРЕДСТАВЛЕНИЕ КЛАССА СЛОЖНОСТИ NP ∩ coNP</article-title><trans-title-group xml:lang="en"><trans-title>RECURSIVE PRESENTATION OF THE COMPLEXITY CLASS NP∩coNP</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>НАЙДЕНКО</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>NAIDENKO</surname><given-names>V. G.</given-names></name></name-alternatives><email xlink:type="simple">vladimir.naidenko@gmail.com</email><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>2016</year></pub-date><pub-date pub-type="epub"><day>28</day><month>10</month><year>2016</year></pub-date><volume>60</volume><issue>4</issue><fpage>35</fpage><lpage>37</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; НАЙДЕНКО В.Г., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">НАЙДЕНКО В.Г.</copyright-holder><copyright-holder xml:lang="en">NAIDENKO V.G.</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/327">https://doklady.belnauka.by/jour/article/view/327</self-uri><abstract><p>Впервые получена рекурсивная представимость одного из базовых классов сложности NP ∩coNP с использованием полиномиальных недетерминированных машин Тьюринга.</p></abstract><trans-abstract xml:lang="en"><p>Using nondeterministic polynomial time Turing machines, a recursive presentation of the complexity class NP ∩ coNP has been constructed for the first time.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>вычислительная сложность</kwd><kwd>рекурсивная представимость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>computational complexity</kwd><kwd>recursive presentation</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">Brassard, G. 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