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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">10.26907/2949-3919.2024.3.4-28</article-id><article-id custom-type="elpub" pub-id-type="custom">matatecs-50</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>Мало квазипроективные модули</article-title><trans-title-group xml:lang="en"><trans-title>Small quasi-projective modules</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>Абызов</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Abyzov</surname><given-names>А. N.</given-names></name></name-alternatives><bio xml:lang="ru"><sec><title>Адель Наилевич Абызов</title><p>ул. Кремлевская, д. 18, г. Казань, 420008</p></sec></bio><bio xml:lang="en"><sec><title>Adel Nailevich Abyzov</title><p>18 Kremlyovskaya str., Kazan 420008</p></sec></bio><email xlink:type="simple">Adel.Abyzov@kpfu.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>Буй</surname><given-names>Т. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Bui</surname><given-names>T. D.</given-names></name></name-alternatives><bio xml:lang="ru"><sec><title>Буй Тиен Дат</title><p>ул. Кремлевская, д. 18, г. Казань, 420008</p><p>ул. Нгуен Ван Ку, д. 256, г. Кантхо, Вьетнам</p></sec></bio><bio xml:lang="en"><sec><title>Bui Tien Dat</title><p>18 Kremlyovskaya str., Kazan 420008</p><p>256 Nguyen Van Cu str., Can Tho, Vietnam</p></sec></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет; Факультет информационных технологий, Технологический университет Кантхо</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University; Can Tho University of Technology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>19</day><month>10</month><year>2024</year></pub-date><volume>2</volume><issue>3</issue><fpage>4</fpage><lpage>28</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Абызов А.Н., Буй Т.Д., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Абызов А.Н., Буй Т.Д.</copyright-holder><copyright-holder xml:lang="en">Abyzov А.N., Bui T.D.</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/50">https://matatecs.elpub.ru/jour/article/view/50</self-uri><abstract><p>Исследованы мало квазипроективные модули и близкие к ним классы модулей. Понятие мало квазипроективного модуля двойственно к понятию существенно квазиинъективного модуля, которое в последнее время было изучено в ряде работ. Показано, что над совершенными справа кольцами класс мало квазипроективных правых модулей совпадает с рядом классов правых модулей, близких к проективным, исследованных в статье. В качестве следствия полученных результатов приведена хорошо известная теорема А.А. Туганбаева о совпадении классов квазипроективных правых модулей и эндоморфизм-поднимаемых правых модулей над совершенными справа кольцами. Также получены характеризации модулей M, для которых в категории σ[M ] каждый (конечнопорожденный, циклический, полупростой, простой) модуль является малопроективным в σ[M ]. </p></abstract><trans-abstract xml:lang="en"><p>We study small quasi-projective modules and closely related classes of modules. The concept of a small quasi-projective module is dual to the concept of an essentially quasi-injective module, which has recently been studied in several works. It is shown that over right perfect rings, the class of small quasi-projective right modules coincides with a number of classes of right modules close to projective modules, which are studied in the article. As a consequence of the obtained results, the well-known A.A. Tuganbaev’s theorem on the coincidence of the classes of quasi-projective right modules and endomorphism-lifting right modules over right perfect rings is presented. Also, characterizations are obtained for modules M , for which in the category σ[M ] every (finitely generated, cyclic, semisimple, simple) module is small projective in σ[M ].</p></trans-abstract><kwd-group xml:lang="ru"><kwd>существенно инъективные модули</kwd><kwd>мало проективные модули</kwd><kwd>мало эндоморфизм поднимаемые модули</kwd><kwd>совершенные кольца</kwd></kwd-group><kwd-group xml:lang="en"><kwd>essentially injective modules</kwd><kwd>small projective modules</kwd><kwd>small endomorphism-liftable modules</kwd><kwd>perfect rings</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work is supported by the Russian Science Foundation (grant no. 22-21-00267).</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">R.E. Johnson, E.T. Wong, Quasi-injective modules and irreducible rings, J. London Math. Soc. 36, 260–268 (1961). DOI: https://doi.org/10.1112/jlms/s1-36.1.260</mixed-citation><mixed-citation xml:lang="en">R.E. Johnson, E.T. Wong, Quasi-injective modules and irreducible rings, J. London Math. Soc. 36, 260–268 (1961). DOI: https://doi.org/10.1112/jlms/s1-36.1.260</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">A.A. Tuganbaev, Semidistributive modules and rings, Mathematics and its Applications 449, Kluwer Academic Publishers, Dordrecht, 1998. DOI: https://doi.org/10.1007/978-94-011-5086-6</mixed-citation><mixed-citation xml:lang="en">A.A. Tuganbaev, Semidistributive modules and rings, Mathematics and its Applications 449, Kluwer Academic Publishers, Dordrecht, 1998. DOI: https://doi.org/10.1007/978-94-011-5086-6</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">А.А. Туганбаев, Характеризации колец, использующие малоинъективные и малопроективные модули, Вестн. Моск. ун-та. Сер. 1. Математика, механика (3), 48–51 (1979).</mixed-citation><mixed-citation xml:lang="en">A.A. Tuganbaev, Characterizations of rings using skew-injective and skew-projective modules, Moscow Univ. Math. Bull. (3), 48–51 (1979) [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">S.E. Dickson, K.R. Fuller, Algebras for which every indecomposable right module is invariant in its injective envelope, Pac. J. Math. 31 (3), 655–658 (1969). DOI: https://doi.org/10.2140/pjm.1969.31.655</mixed-citation><mixed-citation xml:lang="en">S.E. Dickson, K.R. Fuller, Algebras for which every indecomposable right module is invariant in its injective envelope, Pac. J. Math. 31 (3), 655–658 (1969). DOI: https://doi.org/10.2140/pjm.1969.31.655</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">S. Singh, A.K. Srivastava, Dual automorphism-invariant modules, J. Algebra 371, 262–275 (2012). DOI: https://doi.org/10.1016/j.jalgebra.2012.08.012</mixed-citation><mixed-citation xml:lang="en">S. Singh, A.K. Srivastava, Dual automorphism-invariant modules, J. Algebra 371, 262–275 (2012). DOI: https://doi.org/10.1016/j.jalgebra.2012.08.012</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">A.N. Abyzov, T.C. Quynh, Lifting of automorphisms of factor modules, Comm. Algebra 46 (11), 5073–5082 (2018). DOI: https://doi.org/10.1080/00927872.2018.1461884</mixed-citation><mixed-citation xml:lang="en">A.N. Abyzov, T.C. Quynh, Lifting of automorphisms of factor modules, Comm. Algebra 46 (11), 5073–5082 (2018). DOI: https://doi.org/10.1080/00927872.2018.1461884</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">A.N. Abyzov, T.C. Quynh, N.T.T. Ha, T. Yildirim, Modules close to the automorphism invariant and coinvariant, J. Algebra Appl. 18 (12), art. 1950235 (2019). DOI: https://doi.org/10.1142/S0219498819502359</mixed-citation><mixed-citation xml:lang="en">A.N. Abyzov, T.C. Quynh, N.T.T. Ha, T. Yildirim, Modules close to the automorphism invariant and coinvariant, J. Algebra Appl. 18 (12), art. 1950235 (2019). DOI: https://doi.org/10.1142/S0219498819502359</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">А.Н. Абызов, Т.Д. Буй, Существенно квазиинъективные модули и их прямые суммы, Изв. вузов. Матем. (7), 9–23 (2024). DOI: https://doi.org/10.26907/0021-3446-2024-7-9-23</mixed-citation><mixed-citation xml:lang="en">A.N. Abyzov, T.D. Bui, Essentially quasi-injective modules and their direct sums, Russian Mathematics (Iz. VUZ) (7), 9–23 (2024) [in Russian]. DOI: https://doi.org/10.26907/0021-3446-2024-7-9-23</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">А.А. Туганбаев, Теория колец. Арифметические модули и кольца, МЦНМО, М., 2009.</mixed-citation><mixed-citation xml:lang="en">A.A. Tuganbaev, Ring theory. Arithmetic modules and rings, MCCME, Moscow, 2009 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">R. Wisbauer, Foundations of module and ring theory. A handbook for study and research, Gordon and Breach Science Publishers, Philadelphia, PA, 1991. DOI: https://doi.org/10.1201/9780203755532</mixed-citation><mixed-citation xml:lang="en">R. Wisbauer, Foundations of module and ring theory. A handbook for study and research, Gordon and Breach Science Publishers, Philadelphia, PA, 1991. DOI: https://doi.org/10.1201/9780203755532</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Ф. Каш, Модули и кольца, Мир, М., 1981.</mixed-citation><mixed-citation xml:lang="en">F. Kasch, Modules and rings, London Mathematical Society Monographs 17, Academic Press, Inc., London–New York, 1982.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">J. Clark, C. Lomp, N. Vanaja, R. Wisbauer, Lifting modules. Supplements and projectivity in module theory, Birkh¨auser Verlag, Basel, 2006. DOI: https://doi.org/10.1007/3-7643-7573-6</mixed-citation><mixed-citation xml:lang="en">J. Clark, C. Lomp, N. Vanaja, R. Wisbauer, Lifting modules. Supplements and projectivity in module theory, Birkh¨auser Verlag, Basel, 2006. DOI: https://doi.org/10.1007/3-7643-7573-6</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">A.N. Abyzov, B.T. Dat, T.C. Quynh, Small dual-ADS modules, small ADS# and small ADS* modules, Lobachevskii J. Math. 44 (12), 5097–5115 (2023). DOI: https://doi.org/10.1134/S1995080223120028</mixed-citation><mixed-citation xml:lang="en">A.N. Abyzov, B.T. Dat, T.C. Quynh, Small dual-ADS modules, small ADS# and small ADS* modules, Lobachevskii J. Math. 44 (12), 5097–5115 (2023). DOI: https://doi.org/10.1134/S1995080223120028</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">P.A. Guil Asensio, D. Keskin Tu¨tu¨ncu¨, B. Kalebo˜gaz, A.K. Srivastava, Modules which are coinvariant under automorphisms of their projective covers, J. Algebra 466, 147–152 (2016). DOI: https://doi.org/10.1016/j.jalgebra.2016.08.004</mixed-citation><mixed-citation xml:lang="en">P.A. Guil Asensio, D. Keskin Tu¨tu¨ncu¨, B. Kalebo˜gaz, A.K. Srivastava, Modules which are coinvariant under automorphisms of their projective covers, J. Algebra 466, 147–152 (2016). DOI: https://doi.org/10.1016/j.jalgebra.2016.08.004</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">A.A. Tuganbaev, Arithmetical rings and endomorphisms, De Gruyter, Berlin, 2019. DOI: https://doi.org/10.1515/9783110659825</mixed-citation><mixed-citation xml:lang="en">A.A. Tuganbaev, Arithmetical rings and endomorphisms, De Gruyter, Berlin, 2019. DOI: https://doi.org/10.1515/9783110659825</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">А.Н. Абызов, Ч.К. Куинь, А.А. Туганбаев, Модули, инвариантные относительно автоморфизмов и идемпотентных эндоморфизмов своих оболочек и накрытий, Итоги науки и техн. Соврем. мат. и ее прил. Темат. обз. 159, 3–45 (2019). URL: https://www.mathnet.ru/rus/into414</mixed-citation><mixed-citation xml:lang="en">A.N. Abyzov, T.C. Quynh, A.A. Tuganbaev, Modules that are invariant with respect to automorphisms and idempotent endomorphisms of their hulls and covers, J. Math. Sci. 256 (3), 235–277 (2021). DOI: https://doi.org/10.1007/s10958-021-05427-x]</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">A.A. Tuganbaev, Automorphism-liftable modules, J. Algebra Appl. 21 (6), art. 2250106 (2022). DOI: https://doi.org/10.1142/S0219498822501067</mixed-citation><mixed-citation xml:lang="en">A.A. Tuganbaev, Automorphism-liftable modules, J. Algebra Appl. 21 (6), art. 2250106 (2022). DOI: https://doi.org/10.1142/S0219498822501067</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>
