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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">matatecs</journal-id><journal-title-group><journal-title xml:lang="ru">Математика и теоретические компьютерные науки</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematics and Theoretical Computer Science</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-3919</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/2949-3919.2026.1.47-66</article-id><article-id custom-type="elpub" pub-id-type="custom">matatecs-104</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></article-categories><title-group><article-title>Вычислимые накрытия арифметических классов программных систем</article-title><trans-title-group xml:lang="en"><trans-title>Computable covers for arithmetical collections of programming systems</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>Файзрахманов</surname><given-names>М. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Faizrahmanov</surname><given-names>M. Kh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Марат Хайдарович Файзрахманов</p><p>Ул. Кремлевская, д. 18, Казань, 420008</p></bio><bio xml:lang="en"><p>Marat Khaidarovich Faizrahmanov</p><p>18 Kremlyovskaya str., Kazan 420008</p></bio><email xlink:type="simple">marat.faizrahmanov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет, Научно-образовательный математический центр ПФО</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University, Volga Region Mathematical Center</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>22</day><month>06</month><year>2026</year></pub-date><volume>4</volume><issue>1</issue><fpage>47</fpage><lpage>66</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Файзрахманов М.Х., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Файзрахманов М.Х.</copyright-holder><copyright-holder xml:lang="en">Faizrahmanov M.K.</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://matatecs.elpub.ru/jour/article/view/104">https://matatecs.elpub.ru/jour/article/view/104</self-uri><abstract><p>В работе получены достаточные условия существования неглавных накрытий (относительно сводимости нумераций) классов нумераций, вычислимых в арифметической иерархии. Полученные условия, помимо прочего, позволяют построить неглавное вычислимое накрытие класса всех фридберговых нумераций и прояснить вопрос о возможных мощностях факторполурешеток Роджерса относительно арифметических идеалов. В работе также доказывается, что идеал полурешетки Роджерса семейства всех унарных частичных рекурсивных функций, порожденный прямыми суммами бесконечных последовательностей ее фридберговых атомов, является собственным подидеалом идеала всех его не наибольших элементов.</p></abstract><trans-abstract xml:lang="en"><p>We obtain sufficient conditions for the existence of non-acceptable covers (with respect to the reducibility of numberings) for classes of numberings computable in the arithmetical hierarchy. These conditions, among other things, imply that the class of all Friedberg computable numberings has a non-acceptable computable cover and allow us to clarify the question of possible cardinalities of Rogers quotient semilattices with respect to arithmetical ideals. We also prove that the ideal in the Rogers semilattice of the family of all unary partial recursive functions generated by the direct sums of infinite sequences of its Friedberg-atoms is a proper subideal of the ideal of all its non-greatest elements.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>вычислимая нумерация</kwd><kwd>допустимая нумерация</kwd><kwd>фридбергова нумерация</kwd><kwd>класс Роджерса</kwd><kwd>полурешетка Роджерса</kwd></kwd-group><kwd-group xml:lang="en"><kwd>computable numbering</kwd><kwd>acceptable numbering</kwd><kwd>Friedberg numbering</kwd><kwd>Rogers class</kwd><kwd>Rogers semilattice</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена за счет предоставленного в 2026 году Фондом науки и технологий Республики Татарстан гранта на осуществление фундаментальных и прикладных научных работ в научных и образовательных организациях, предприятиях и организациях реального сектора экономики Республики Татарстан</funding-statement><funding-statement xml:lang="en">This work was supported by the Science and Technology Fund of the Republic of Tatarstan grant for the implementation of fundamental and applied scientific research in scientific and educational organizations, enterprises and organizations of the real sector of the economy of the Republic of Tatarstan</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">S.A. 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