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<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2020-21-1-186-199</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-788</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>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Об элементарных теориях алгебраически замкнутых групп</article-title><trans-title-group xml:lang="en"><trans-title>On elementary theories of algebraically closed groups</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>Дурнев</surname><given-names>Валерий Георгиевич</given-names></name><name name-style="western" xml:lang="en"><surname>Durnev</surname><given-names>Valery Georgievch</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><bio xml:lang="en"><p>doctor of phisics and mathematics, professor</p></bio><email xlink:type="simple">durnev@uniyar.ac.ru</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>Зеткина</surname><given-names>Оксана Валерьевна</given-names></name><name name-style="western" xml:lang="en"><surname>Zetkina</surname><given-names>Oksana Valerievna</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат экономических наук, доцент</p></bio><bio xml:lang="en"><p>candidate of economic sciences, associate professor</p></bio><email xlink:type="simple">ovzetkina@yandex.ru</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>Зеткина</surname><given-names>Алена Игоревна</given-names></name><name name-style="western" xml:lang="en"><surname>Zetkina</surname><given-names>Alena Igorevna</given-names></name></name-alternatives><bio xml:lang="ru"><p>ассистент</p></bio><bio xml:lang="en"><p>assistent</p></bio><email xlink:type="simple">ovzetkina@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ярославский государственный университет имени П. Г. Демидова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>P. G. Demidov Yaroslavl’ University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>20</day><month>04</month><year>2020</year></pub-date><volume>21</volume><issue>1</issue><elocation-id>186–199</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Дурнев В.Г., Зеткина О.В., Зеткина А.И., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Дурнев В.Г., Зеткина О.В., Зеткина А.И.</copyright-holder><copyright-holder xml:lang="en">Durnev V.G., Zetkina O.V., Zetkina A.I.</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://www.chebsbornik.ru/jour/article/view/788">https://www.chebsbornik.ru/jour/article/view/788</self-uri><abstract><p>В статье доказана алгоритмическая неразрешимость позитивных $\forall^2 \exists^{24}$-теории и $\forall^3 \exists^{2}$-теории любой алгебраически замкнутой группы и класса всех алгебраически замкнутых групп. Установлена разрешимость в любой алгебраически замкнутой группе $G$ каждого уравнения вида$$w(x_1, \ldots , x_n) = g,$$где $w(x_1, \ldots , x_n)$ - непустое несократимое групповое слово от неизвестных $x_1$, ...., $x_n$, а $g$ - произвольный элемент группы $G$.</p></abstract><trans-abstract xml:lang="en"><p>In paper for any algebraically closed group $G$, as well as for the class of the algebraically closed groups, we prove algorithmic undecidability of the positive $\forall^2 \exists^{24}$-theory and $\forall^3 \exists^{2}$-theory. For an arbitrary $g\in G$, we also prove the decidability of the equation of the type$$w(x_1, \ldots , x_n) = g,$$where $w(x_1, \ldots , x_n)$ is a non-empty irreducible word in the unknowns $x_1,\ldots x_n\in G$.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>алгебраически замкнутая группа</kwd><kwd>позитивная теория</kwd><kwd>уравнение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>algebraically closed group</kwd><kwd>positive theory</kwd><kwd>equation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
