<?xml version="1.0" encoding="UTF-8"?>
<!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">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">10.26907/2949-3919.2024.1.55-73</article-id><article-id custom-type="elpub" pub-id-type="custom">matatecs-39</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>Локально конечные и финитно аппроксимируемые уноиды над вычислимо отделимыми эквивалентностями</article-title><trans-title-group xml:lang="en"><trans-title>Locally finite and finitely approximated unoids over computably separable equivalences</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>Касымов</surname><given-names>Н. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Kasymov</surname><given-names>N. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Надимулла Хабибуллаевич Касымов </p><p>ул. Университетская, д. 4, г. Ташкент, 100174 </p></bio><bio xml:lang="en"><p>Nadimulla Khabibullaevich Kasymov </p><p>4 Universitetskaya str., Tashkent 100174 </p></bio><email xlink:type="simple">nadim59@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный университет Узбекистана им. Мирзо Улугбека</institution><country>Узбекистан</country></aff><aff xml:lang="en"><institution>National Universitet of Uzbekistan</institution><country>Uzbekistan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>15</day><month>04</month><year>2024</year></pub-date><volume>2</volume><issue>1</issue><fpage>55</fpage><lpage>73</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Касымов Н.Х., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Касымов Н.Х.</copyright-holder><copyright-holder xml:lang="en">Kasymov N.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/39">https://matatecs.elpub.ru/jour/article/view/39</self-uri><abstract><p>Доказано, что всякое кобесконечное множество является характеристической трансверсалью подходящей вычислимо отделимой эквивалентности, над которой представимы только локально конечные, локально финитно отделимые и финитно аппроксимируемые унарные алгебры. Рассмотрены аналогичные свойства для равномерно вычислимо отделимых эквивалентностей.</p></abstract><trans-abstract xml:lang="en"><p>We prove that every coinfinite set is a characteristic transversal of a suitably computably separable equivalence relation, over which only locally finite, locally finite separable and finitely approximable unary algebras are represented. Similar properties for uniformly computable separable equivalences are considered.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>вычислимо отделимая эквивалентность</kwd><kwd>равномерность</kwd><kwd>характеристическая трансверсаль</kwd><kwd>унарная алгебра</kwd><kwd>локальная конечность</kwd><kwd>финитная аппроксимируемость</kwd><kwd>локально финитная отделимость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>computably separable equivalence</kwd><kwd>uniformity</kwd><kwd>characteristic transversal</kwd><kwd>unary algebra</kwd><kwd>local finiteness</kwd><kwd>finite approximability</kwd><kwd>locally finite separability</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">Ю.Л. Ершов, Теория нумераций, Наука, М., 1977.</mixed-citation><mixed-citation xml:lang="en">Yu.L. Ershov, Theory of numberings, Nauka, M., 1977 [in Russian.].</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Yu.L. Ershov, Theory of numberings, in: E.R. Griffor (ed.), Handbook of computability theory (Stud. Logic Found. Math., 140), Amsterdam, Elsevier, 1999, 473–503. DOI: https://doi.org/10.1016/S0049-237X(99)80030-5</mixed-citation><mixed-citation xml:lang="en">Yu. L. Ershov, Theory of numberings, in: E.R. Griffor (ed.), Handbook of computability theory (Stud. Logic Found. Math., 140), Amsterdam, Elsevier, 1999, 473–503. DOI: https://doi.org/10.1016/S0049-237X(99)80030-5</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">R.I. Soare, Recursively enumerable sets and degrees. A study of computable functions and computably generated sets, Perspectives in mathematical logic. Springer-Verlag, Berlin, Heidelberg, New York, etc., 1987. URL: https://link.springer.com/book/9783540666813</mixed-citation><mixed-citation xml:lang="en">R. I. Soare, Recursively enumerable sets and degrees. A study of computable functions and computably generated sets, Perspectives in mathematical logic. Springer-Verlag, Berlin, Heidelberg, New York, etc., 1987. URL: https://link.springer.com/book/9783540666813</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">С.С. Гончаров, Ю.Л. Ершов, Конструктивные модели, Научная книга, Новосибирск, 1999.</mixed-citation><mixed-citation xml:lang="en">S.S. Goncharov, Yu.L. Ershov, Constructive Models, Siberian School of Algebra and Logic. Consultants Bureau, New York, 2000.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">П.М. Кон, Универсальная алгебра, Мир, М., 1968.</mixed-citation><mixed-citation xml:lang="en">P.M. Cohn, Universal algebra, MAIA 6, D. Reidel Publishing Co., Dordrecht–Boston, Mass., 1981. DOI: https://doi.org/10.1007/978-94-009-8399-1</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">А.И. Мальцев, Алгебраические системы, Наука, М., 1970.</mixed-citation><mixed-citation xml:lang="en">A.I.Mal’tsev, Algebraic Systems, Springer-Verlag, New York–Heidelberg, 1973. DOI: https://doi.org/10.1007/978-3-642-65374-2</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">U. Andrews, A. Sorbi, Joins and meets in the structure of ceers, Computability 8 (3–4), 193–241 (2019). DOI: https://doi.org/10.3233/COM-180098</mixed-citation><mixed-citation xml:lang="en">U. Andrews, A. Sorbi, Joins and meets in the structure of ceers, Computability 8 (3–4), 193–241 (2019). DOI: https://doi.org/10.3233/COM-180098</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">U. Andrews, D.F. Belin, L. San Mauro, On the structure of computable reducibility on equivalence relations of natural numbers, J. Symb. Logic 88 (3), 1038–1063 (2023). DOI: https://doi.org/10.1017/jsl.2022.28</mixed-citation><mixed-citation xml:lang="en">U. Andrews, D.F. Belin, L. San Mauro, On the structure of computable reducibility on equivalence relations of natural numbers, J. Symb. Logic 88 (3), 1038–1063 (2023). DOI: https://doi.org/10.1017/jsl.2022.28</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Ф.Н. Ибрагимов, Отделимые нумерации тел и эффективная вложимость в них колец, Сиб. матем. журн. 60 (1), 82–94 (2019). DOI: https://doi.org/10.33048/smzh.2019.60.107</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, F.N. Ibragimov, Separable enumerations of division rings and effective embeddability of rings therein, Siberian Math. J. 60 (1), 62–70 (2019). DOI: https://doi.org/10.1134/S0037446619010075</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">М.М. Арсланов, Об эффективно гиперпростых множествах, Алгебра и логика 8 (2), 143–153 (1969). URL: https://www.mathnet.ru/rus/al1187</mixed-citation><mixed-citation xml:lang="en">M.M. Arslanov, On effectively hypersimple sets, Algebra Logic 8 (2), 79–85 (1969). DOI: https://doi.org/10.1007/BF02219827</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">М.Х. Файзрахманов, Универсальные обобщенно вычислимые нумерации и гипериммунность, Алгебра и логика 56 (4), 506–521 (2017). DOI: https://doi.org/10.17377/alglog.2017.56.408</mixed-citation><mixed-citation xml:lang="en">M.Kh. Faizrakhmanov, Universal generalized computable numberings and hyperimmunity, Algebra Logic 56 (4), 337–347 (2017). DOI: https://doi.org/10.1007/s10469-017-9454-5</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Об алгебрах с финитно аппроксимируемыми позитивно представимыми обогащениями, Алгебра и логика 26 (6), 715–730 (1987). URL: https://www.mathnet.ru/rus/al1999</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Algebras with finitely approximable positively representable enrichments, Algebra Logic 26 (6), 441–450 (1987). DOI: https://doi.org/10.1007/BF01988315</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">А.И. Мальцев, Конструктивные алгебры. I, УМН 16 (3), 3–60 (1961). URL: https://www.mathnet.ru/rus/rm6619</mixed-citation><mixed-citation xml:lang="en">A.I. Mal’tsev, Constructive algebras I, Russian Math. Surveys 16 (3), 77–129 (1961). DOI: https://doi.org/10.1070/RM1961v016n03ABEH001120</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Позитивные алгебры с конгруэнциями конечного индекса, Алгебра и логика 30 (3), 293–305 (1991). URL: https://www.mathnet.ru/rus/al2151</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Positive algebras with congruences of finite index, Algebra Logic 30 (6), 190–199 (1991). DOI: https://doi.org/10.1007/BF01978852</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Рекурсивно отделимые нумерованные алгебры, УМН 51 (3), 145–176 (1996). DOI: https://doi.org/10.4213/rm971</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Recursively separable enumerated algebras, Russian Math. Surveys 51 (3), 509–538 (1996). DOI: https://doi.org/10.1070/RM1996v051n03ABEH002913</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Позитивные алгебры с нетеровыми решетками конгруэнций, Сиб. матем. журн. 33 (2), 181–185 (1992). URL: https://www.mathnet.ru/rus/smj3208</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Positive algebras with nonetherian congruence lattices, Siberian Math. J. 33 (2), 338–341 (1992). DOI: https://doi.org/10.1007/BF00971109</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Позитивные алгебры со счетными решетками конгруэнций, Алгебра и логика 31 (1), 21–37 (1992). URL: https://www.mathnet.ru/rus/al2179</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Positive algebras with countable congruence lattices, Algebra Logic 31 (1), 12–23 (1992). URL: https://doi.org/10.1007/BF02259854</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">J.A. Bergstra, J.V. Tucker, A characterization of computable data types by means of a finite, equational specification method, Lecture Notes in Comput. Sci. 85, 76–90 (1980). DOI: https://doi.org/10.1007/3-540-10003-2_61</mixed-citation><mixed-citation xml:lang="en">J.A. Bergstra, J.V. Tucker, A characterization of computable data types by means of a finite, equational specification method, Lecture Notes in Comput. Sci. 85, 76–90 (1980). DOI: https://doi.org/10.1007/3-540-10003-2_61</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, О гомоморфизмах на негативные алгебры, Алгебра и логика 31 (2), 132–144 (1992). URL: https://www.mathnet.ru/rus/al21868. U. Andrews, D.F. Belin, L. San Mauro, On the structure of computable reducibility on equivalence relations of natural numbers, J. Symb. Logic 88 (3), 1038–1063 (2023). DOI: https://doi.org/10.1017/jsl.2022.28</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Homomorphisms onto negative algebras, Algebra Logic 31 (2), 81–89 (1992). DOI: https://doi.org/10.1007/BF02259847</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, О гомоморфизмах на эффективно отделимые алгебры, Сиб. матем. журн. 57 (1), 47–66 (2016). DOI: https://doi.org/10.17377/smzh.2016.57.105</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Homomorphisms onto effectively separable algebras, Siberian Math. J. 57 (1), 36–50 (2016). DOI: https://doi.org/10.1134/S0037446616010055</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Нумерованные алгебры с равномерно рекурсивно отделимыми классами, Сиб. матем. журн. 34 (5), 85–102 (1993). URL: https://www.mathnet.ru/rus/smj836</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Enumerated algebras with uniformly recursive-separable classes, Siberian Math. J. 34 (5), 869–882 (1993). DOI: https://doi.org/10.1007/BF00971403</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">А.И. Мальцев, К общей теории алгебраических систем, Матем. сб. 35 (1), 3–20 (1954). URL: https://www.mathnet.ru/rus/sm5264</mixed-citation><mixed-citation xml:lang="en">A.I. Mal’tsev, On the general theory of algebraic systems, Amer. Math. Soc. Transl. Ser. 2 27, 125–142 (1963).</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Р.Н. Дадажанов, С.К. Джавлиев, Структуры степеней негативной представимости линейных порядков, Изв. вузов. Матем. 65 (12), 31–55 (2021). URL: https://doi.org/10.26907/0021-3446-2021-12-31-55</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, R.N. Dadazhanov, S.K. Zhavliev, Structures of degrees of negative representations of linear orders, Russ. Math. 65 (12), 27–46 (2021). DOI: https://doi.org/10.3103/S1066369X21120045</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Вычислимо отделимые нумерации локально финитно отделимых алгебр, Сиб. электрон. матем. изв. (принята к печати).</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Computably separable numbering of locally finite separable algebras, Sib. Electron. Math. Rep. (to appear).</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">C.G. Jockusch, J.C. Owings, Weakly semirecursive sets, J. Symb. Log. 55 (2), 637–644 (1990). DOI: https://doi.org/10.2307/2274653</mixed-citation><mixed-citation xml:lang="en">C.G. Jockusch, J.C. Owings, Weakly semirecursive sets, J. Symb. Log. 55 (2), 637–644 (1990). DOI: https://doi.org/10.2307/2274653</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, А.С. Морозов, Нижние полурешетки отделимых конгруэнций нумерованных алгебр, Сиб. матем. журн. 64 (4), 753–769 (2023). DOI: https://doi.org/10.33048/smzh.2023.64.408</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, A.S. Morozov, Lower semilattices of separable congruences of numbered algebras, Siberian Math. J. 64 (4), 864–876 (2023). DOI: https://doi.org/10.1134/S0037446623040080</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Н.Х. Касымов, Об алгебрах над негативными эквивалентностями, Алгебра и логика 33 (1), 76–90 (1994). URL: https://www.mathnet.ru/rus/al2257</mixed-citation><mixed-citation xml:lang="en">N.Kh. Kasymov, Algebras over negative equivalences, Algebra logic 33 (1), 46–48 (1994). DOI: https://doi.org/10.1007/BF00739416</mixed-citation></citation-alternatives></ref></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>
