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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">izvuzmath</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3446</issn><issn pub-type="epub">2076-4626</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/0021-3446-2024-11-23-34</article-id><article-id custom-type="elpub" pub-id-type="custom">izvuzmath-128</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>О НЕРАВЕНСТВЕ РИССА И БАЗИСНОСТИ СИСТЕМ КОРНЕВЫХ ВЕКТОР-ФУНКЦИЙ ОПЕРАТОРА ТИПА ДИРАКА 2m-ГО ПОРЯДКА С СУММИРУЕМЫМ КОЭФФИЦИЕНТОМ</article-title><trans-title-group xml:lang="en"><trans-title>On the Ries inequality and the basicity of systems of root vector functions of 2mth order Dirac-type operator with summable coefficient</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>Ибадов</surname><given-names>Э. Дж.</given-names></name><name name-style="western" xml:lang="en"><surname>Ibadov</surname><given-names>E. J.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Эльчин Джамал оглы Ибадов</p><p>ул. Узеира Гаджибейли, д. 68, г. Баку, AZ1000</p></bio><bio xml:lang="en"><p>Elchin Jamal ogly Ibadov</p><p>68 Uzeyir Hajibeyov str., Baku, AZ1000 </p></bio><email xlink:type="simple">e.c_ibadov@yahoo.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Азербайджанский государственный педагогический университет</institution><country>Азербайджан</country></aff><aff xml:lang="en"><institution>Azerbaijan State Pedagogical University</institution><country>Azerbaijan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>02</day><month>12</month><year>2024</year></pub-date><volume>0</volume><issue>11</issue><fpage>23</fpage><lpage>34</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ибадов Э.Д., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Ибадов Э.Д.</copyright-holder><copyright-holder xml:lang="en">Ibadov E.J.</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://izvuzmath.elpub.ru/jour/article/view/128">https://izvuzmath.elpub.ru/jour/article/view/128</self-uri><abstract><p>Рассматривается оператор типа Дирака 2m-го порядка на конечном интервале G = (a, b). Предполагается, что его коэффициент является комлекснозначной суммируемой на G = (a, b) матрицей-функцией. Устанавливаются критерий риссовости для системы корневых вектор-функций и доказывается теорема об эквивалентной базисности в L2mp (G), 1 &lt; p &lt; ∞</p></abstract><trans-abstract xml:lang="en"><p>We consider a Dirac-type operator of 2mth order on a finite interval G = (a, b). It is assumed that its coefficient is a complex-valued matrix function summable on G =, (a b). A Riesz property criterion is established for a system of root vector functions, and a theorem on the equivalent basis property in  L2mp (G), 1 &lt; p &lt; ∞  is prove</p></trans-abstract><kwd-group xml:lang="ru"><kwd>оператор типа Дирака</kwd><kwd>корневая вектор-функция</kwd><kwd>неравенство Рисса</kwd><kwd>эквивалентная базисность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>operator of Dirac-type</kwd><kwd>root vector function</kwd><kwd>Riesz inequality</kwd><kwd>equivalent basis property</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">Ильин В.А. О безусловной базисности на замкнутом интервале систем собственных и присоединенных функций дифференциального оператора второго порядка, Докл. АН СССР 273 (5), 1048–1053 (1983).</mixed-citation><mixed-citation xml:lang="en">Ильин В.А. О безусловной базисности на замкнутом интервале систем собственных и присоединенных функций дифференциального оператора второго порядка, Докл. АН СССР 273 (5), 1048–1053 (1983).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Курбанов В.М. О бесселевости и безусловной базисности систем корневых вектор-функций оператора Дирака, Дифференц. уравнения 32 (12), 1608–1617 (1996).</mixed-citation><mixed-citation xml:lang="en">Курбанов В.М. О бесселевости и безусловной базисности систем корневых вектор-функций оператора Дирака, Дифференц. уравнения 32 (12), 1608–1617 (1996).</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Kurbanov V.M., Abdullayeva A.M. Bessel property and basicity of the system of root vector-functions of Dirac operator with summable coefficient, Operators and Matrices 12 (4), 943–954 (2018).</mixed-citation><mixed-citation xml:lang="en">Kurbanov V.M., Abdullayeva A.M. Bessel property and basicity of the system of root vector-functions of Dirac operator with summable coefficient, Operators and Matrices 12 (4), 943–954 (2018).</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Курбанов В.М., Исмайлова А.И. Покомпонентная равномерная равносходимость разложений по кор- невым вектор-функциям оператора Дирака с тригонометрическим разложением, Дифференц. урав- нения 48 (5), 648–662 (2012).</mixed-citation><mixed-citation xml:lang="en">Курбанов В.М., Исмайлова А.И. Покомпонентная равномерная равносходимость разложений по кор- невым вектор-функциям оператора Дирака с тригонометрическим разложением, Дифференц. урав- нения 48 (5), 648–662 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Курбанов В.М., Исмайлова А.И. Абсолютная и равномерная сходимость разложений по корневым вектор-функциям оператора Дирака, Докл. РАН 446 (4), 380–383 (2012).</mixed-citation><mixed-citation xml:lang="en">Курбанов В.М., Исмайлова А.И. Абсолютная и равномерная сходимость разложений по корневым вектор-функциям оператора Дирака, Докл. РАН 446 (4), 380–383 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Курбанов В.М., Исмайлова А.И. Неравенство Рисса для систем корневых вектор-функций оператора Дирака, Дифференц. уравнения 48 (3), 334–340 (2012).</mixed-citation><mixed-citation xml:lang="en">Курбанов В.М., Исмайлова А.И. Неравенство Рисса для систем корневых вектор-функций оператора Дирака, Дифференц. уравнения 48 (3), 334–340 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Kurbanov V.M., Ibadov E.J., Hajiyeva G.R. On Bessel property and unconditional basicity of the systems of root vector-functions of Dirac type operator, Azer. J. Math. 7 (2), 20–30 (2017).</mixed-citation><mixed-citation xml:lang="en">Kurbanov V.M., Ibadov E.J., Hajiyeva G.R. On Bessel property and unconditional basicity of the systems of root vector-functions of Dirac type operator, Azer. J. Math. 7 (2), 20–30 (2017).</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Курбанов В.М., Буксаева Л.З. О неравенстве Рисса и базисности систем корневых вектор-функций разрывного оператора Дирака, Дифференц. уравнения 55 (8), 1079–1089 (2019).</mixed-citation><mixed-citation xml:lang="en">Курбанов В.М., Буксаева Л.З. О неравенстве Рисса и базисности систем корневых вектор-функций разрывного оператора Дирака, Дифференц. уравнения 55 (8), 1079–1089 (2019).</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Ибадов Э.Дж. О свойствах систем корневых вектор-функций оператора типа Дирака 2m-го порядка с суммируемым потенциалом, Дифференц.уравнения 59 (10), 1299–1317 (2023).</mixed-citation><mixed-citation xml:lang="en">Ибадов Э.Дж. О свойствах систем корневых вектор-функций оператора типа Дирака 2m-го порядка с суммируемым потенциалом, Дифференц.уравнения 59 (10), 1299–1317 (2023).</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Trooshin I., Yamamota M. Riesz basis of root vectors of a non-symmetric system of first-order ordinary differential operators and application to inverse eigenvalue problems, Appl. Anal. 80 (1), 19–51 (2002).</mixed-citation><mixed-citation xml:lang="en">Trooshin I., Yamamota M. Riesz basis of root vectors of a non-symmetric system of first-order ordinary differential operators and application to inverse eigenvalue problems, Appl. Anal. 80 (1), 19–51 (2002).</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Djakov P., Mityagin B. Bari-Markus property for Riesz projections of 1D periodic Dirac operators, Math. Nachr. 283 (3), 443–462 (2010).</mixed-citation><mixed-citation xml:lang="en">Djakov P., Mityagin B. Bari-Markus property for Riesz projections of 1D periodic Dirac operators, Math. Nachr. 283 (3), 443–462 (2010).</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Djakov P., Mityagin B. Unconditional convergence of spectral decompositions of 1D Dirac operators with regular boundary conditions, Indiana Univ. Math. J. 61 (1), 359–398 (2012).</mixed-citation><mixed-citation xml:lang="en">Djakov P., Mityagin B. Unconditional convergence of spectral decompositions of 1D Dirac operators with regular boundary conditions, Indiana Univ. Math. J. 61 (1), 359–398 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Djakov P., Mityagin B. Criteria for existence of Riesz bases consisting of root functions of Hill and 1D Dirac operators, J. Funct. Anal. 263 (8), 2300–2332 (2012).</mixed-citation><mixed-citation xml:lang="en">Djakov P., Mityagin B. Criteria for existence of Riesz bases consisting of root functions of Hill and 1D Dirac operators, J. Funct. Anal. 263 (8), 2300–2332 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Savchuk A.M., Shkalikov A.A. The Dirac operator with complex-valued summable potential, Math. Notes. 96 (5), 777–810 (2014).</mixed-citation><mixed-citation xml:lang="en">Savchuk A.M., Shkalikov A.A. The Dirac operator with complex-valued summable potential, Math. Notes. 96 (5), 777–810 (2014).</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Савчук А.М., Садовничая И.В. Базисность Рисса со скобками для системы Дирака с суммируемым потенциалом, Совр. матем. Фундамент. направления 58, 128–152 (2015).</mixed-citation><mixed-citation xml:lang="en">Савчук А.М., Садовничая И.В. Базисность Рисса со скобками для системы Дирака с суммируемым потенциалом, Совр. матем. Фундамент. направления 58, 128–152 (2015).</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Lunyov A.A., Malamud M.M. On the Riesz basis property of the root vector system for Dirac-type 2 times 2 systems, Dokl. Math. 90 (2), 556–561 (2014).</mixed-citation><mixed-citation xml:lang="en">Lunyov A.A., Malamud M.M. On the Riesz basis property of the root vector system for Dirac-type 2 times 2 systems, Dokl. Math. 90 (2), 556–561 (2014).</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Lunyov A.A., Malamud M.M. On the Riezs basis property of root vectors system for 2times 2 Dirac-type operators, J. Math. Anal. Appl. 441 (1), 57–103 (2016).</mixed-citation><mixed-citation xml:lang="en">Lunyov A.A., Malamud M.M. On the Riezs basis property of root vectors system for 2times 2 Dirac-type operators, J. Math. Anal. Appl. 441 (1), 57–103 (2016).</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Makin A.S. On convergence of spectral expansions of Dirac operators with regular boundary conditions, Math. Nachr. 295 (1), 189–210 (2022) (arXiv:1902.02952).</mixed-citation><mixed-citation xml:lang="en">Makin A.S. On convergence of spectral expansions of Dirac operators with regular boundary conditions, Math. Nachr. 295 (1), 189–210 (2022) (arXiv:1902.02952).</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Lunyov A.A. Criterion of Bari basis property for 2 times 2 Dirac-type operators with strictly regular boundary conditions, Math. Nachr. 296 (9), 4125–4151 (2023).</mixed-citation><mixed-citation xml:lang="en">Lunyov A.A. Criterion of Bari basis property for 2 times 2 Dirac-type operators with strictly regular boundary conditions, Math. Nachr. 296 (9), 4125–4151 (2023).</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Макин А.С. О двухточечных задачах для операторов Штурма–Лиувилля и Дирака, Итоги науки и техн. Совр. матем. и ее прил. Темат. обзоры 194, 144–154 (2021).</mixed-citation><mixed-citation xml:lang="en">Макин А.С. О двухточечных задачах для операторов Штурма–Лиувилля и Дирака, Итоги науки и техн. Совр. матем. и ее прил. Темат. обзоры 194, 144–154 (2021).</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Birkhoff G.D., Langer R.E. The boundary problems and developments associated with a system of ordinary dfferential equations of the first order, Proc. Amer. Acad. Arts Sci. 58 (2), 51–128 (1923).</mixed-citation><mixed-citation xml:lang="en">Birkhoff G.D., Langer R.E. The boundary problems and developments associated with a system of ordinary dfferential equations of the first order, Proc. Amer. Acad. Arts Sci. 58 (2), 51–128 (1923).</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Корнев В.В., Хромов А.П. Система Дирака с недифференцируемым потенциалом и антипериодиче- скими краевыми условиями, Изв. Саратовск. ун-та. Сер. Матем. Механ. Информатика 13 (3), 28–35 (2013).</mixed-citation><mixed-citation xml:lang="en">Корнев В.В., Хромов А.П. Система Дирака с недифференцируемым потенциалом и антипериодиче- скими краевыми условиями, Изв. Саратовск. ун-та. Сер. Матем. Механ. Информатика 13 (3), 28–35 (2013).</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Marchenco V.A. Sturm–Liouville operators and applications Operator Theory. Adv. Appl. 22 (Birkhauser Verlag, Basel, 1986).</mixed-citation><mixed-citation xml:lang="en">Marchenco V.A. Sturm–Liouville operators and applications Operator Theory. Adv. Appl. 22 (Birkhauser Verlag, Basel, 1986).</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Malamud M.M., Oridoroga L.L. On the completeness of root subspaces of boundary value problems for first order systems of ordinary differential equations, J. Funct. Anal. 263, 1939–1980 (2012).</mixed-citation><mixed-citation xml:lang="en">Malamud M.M., Oridoroga L.L. On the completeness of root subspaces of boundary value problems for first order systems of ordinary differential equations, J. Funct. Anal. 263, 1939–1980 (2012).</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Mykytnyk Ya.V., Puyda D.V. Bari–Markus property of Dirac operators, Mat. Stud. 40 (2), 165–171 (2013).</mixed-citation><mixed-citation xml:lang="en">Mykytnyk Ya.V., Puyda D.V. Bari–Markus property of Dirac operators, Mat. Stud. 40 (2), 165–171 (2013).</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Lunyov A.A., Malamud M.M. On the completeness and Riesz basis property of root subspaces of boundary value problems for first order systems and applications, JST 5 (1), 17–70 (2015).</mixed-citation><mixed-citation xml:lang="en">Lunyov A.A., Malamud M.M. On the completeness and Riesz basis property of root subspaces of boundary value problems for first order systems and applications, JST 5 (1), 17–70 (2015).</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Шкаликов А.А. Регулярные спектральные задачи гиперболического типа для системы обыкновенных дифференциальных уравнений первого порядка, Матем. заметки 110 (5), 796–800 (2021).</mixed-citation><mixed-citation xml:lang="en">Шкаликов А.А. Регулярные спектральные задачи гиперболического типа для системы обыкновенных дифференциальных уравнений первого порядка, Матем. заметки 110 (5), 796–800 (2021).</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Lunyov A.A., Malamud M.M. On transformation operators and Riesz basis property of root vectors system for n times n Dirac-type operators, Appl. to the Timoshenko beam model, arXiv:2112.07248..</mixed-citation><mixed-citation xml:lang="en">Lunyov A.A., Malamud M.M. On transformation operators and Riesz basis property of root vectors system for n times n Dirac-type operators, Appl. to the Timoshenko beam model, arXiv:2112.07248..</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Зигмунд А. Тригонометрические ряды, Т. 2 (Мир, М., 1965)</mixed-citation><mixed-citation xml:lang="en">Зигмунд А. Тригонометрические ряды, Т. 2 (Мир, М., 1965)</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>
