<?xml version="1.0" encoding="UTF-8"?>
<article article-type="research-article" dtd-version="1.1" 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">
  <front>
    <journal-meta>
      <issn publication-format="print">1683-3414</issn>
      <issn publication-format="electronic">1814-0807</issn>
      <journal-title-group>
        <journal-title>Владикавказский математический журнал</journal-title>
        <trans-title-group xml:lang="en">
          <trans-title>Vladikavkaz Mathematical Journal</trans-title>
        </trans-title-group>
      </journal-title-group>
      <publisher>
        <publisher-name>Южный математический институт - филиал Федерального государственного бюджетного учреждения науки Федерального научного центра «Владикавказский научный центр Российской академии наук» (ЮМИ ВНЦ РАН)</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <title-group>
        <article-title>Применение метода повторного квантования к одному классу нефуксовых уравнений</article-title>
      </title-group>
      <trans-title-group xml:lang="en">
        <trans-title>Application of the Repeated Quantization Method to a Class of Non-Fuchsian Equations</trans-title>
      </trans-title-group>
      <article-id pub-id-type="doi">10.46698/i7249-6874-2842-b</article-id>
      <article-id pub-id-type="publisher-id">17982</article-id>
      <pub-date publication-format="electronic" date-type="pub">
        <month>12</month>
        <year>2025</year>
      </pub-date>
      <volume>27</volume>
      <issue>4</issue>
      <fpage>61</fpage>
      <lpage>71</lpage>
      <self-uri xlink:href="https://vmj.ru/archive/detail.php?ELEMENT_ID=17982&amp;SECTION_ID=646">https://vmj.ru/archive/detail.php?ELEMENT_ID=17982&amp;SECTION_ID=646</self-uri>
      <contrib-group>
        <contrib contrib-type="author">
          <name-alternatives>
            <name xml:lang="ru">
              <surname>Коровина</surname>
              <given-names>М. В.</given-names>
            </name>
            <name xml:lang="en">
              <surname>Korovina</surname>
              <given-names>M. V.</given-names>
            </name>
          </name-alternatives>
          <email>betelgeuser@yandex.ru</email>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <contrib contrib-type="author">
          <name-alternatives>
            <name xml:lang="ru">
              <surname>Смирнов</surname>
              <given-names>В. Ю.</given-names>
            </name>
            <name xml:lang="en">
              <surname>Smirnov</surname>
              <given-names>V. Yu.</given-names>
            </name>
          </name-alternatives>
          <email>vl-smirnov@mail.ru</email>
          <xref ref-type="aff" rid="aff2"/>
        </contrib>
      </contrib-group>
      <aff-alternatives id="aff1">
        <aff xml:lang="ru">Московский государственный университет им. М. В. Ломоносова, РОССИЯ, 119991, Москва, Ленинские горы, 1</aff>
        <aff xml:lang="en">Lomonosov Moscow State University, 1 Leninskiye Gory, Moscow 119991, Russia</aff>
      </aff-alternatives>
      <aff-alternatives id="aff2">
        <aff xml:lang="ru"> Московский авиационный институт  (Национальный исследовательский университет), РОССИЯ, 125993, Москва, Волоколамское шоссе, 4</aff>
        <aff xml:lang="en">Moscow Aviation Institute  (National Research University), 4 Volokolamskoe Shosse, Moscow 125993, Russia</aff>
      </aff-alternatives>
      <abstract>Одной из фундаментальных проблем аналитической теории обыкновенных дифференциальных уравнений является проблема построения асимптотик решений дифференциальных уравнений в окрестностях иррегулярных особых точек. В общем виде эта проблема до сих пор не решена. Однако в последние годы для ее решения был создан метод повторного квантования, который позволяет строить асимптотики решений для широкого класса уравнений с иррегулярными особенностями. Данная работа посвящена его развитию. К примеру, этим методом удалось построить асимптотические решения для дифференциальных уравнений с голоморфными коэффициентами в окрестности бесконечно удаленной особой точки, которая, вообще говоря, является иррегулярной. Метод повторного квантования основан на методах ресургентного анализа, т. е. на применении преобразования Лапласа - Бореля. Он применяется в том случае, когда корни основного символа являются кратными. С помощью результатов этой статьи расширяется класс уравнений с иррегулярными особыми точками, к которым метод повторного квантования применим. А именно к тем уравнениям с иррегулярной особой точкой, для которых асимптотики решений исходного уравнения в образах Лапласа - Бореля содержат экспоненты с показателями в виде полиномов от дробной степени переменной. Применение полученных результатов к уравнению такого типа проиллюстрировано на конкретном примере.</abstract>
      <trans-abstract xml:lang="en">One of the fundamental problems of the analytic theory of ordinary differential equations is the problem of constructing asymptotics of solutions of differential equations in the neighborhood of irregular singular points. In general, this problem has not yet been solved. However, in recent years, the method of repeated quantization has been created to solve this problem, which allows constructing asymptotics of solutions for a wide class of equations with irregular singularities. This work is devoted to the development of this method. For example, this method has been used to construct asymptotic solutions for differential equations with holomorphic coefficients in the neighborhood of an infinitely distant singular point, which, generally speaking, is irregular. The method of repeated quantization is based on the methods of resurgent analysis, that is, on the application of the Laplace-Borel transform. This method is applied when the roots of the principal symbol are multiple. Using the results of this article, the class of equations with irregular singular points to which the repeated quantization method is applicable is expanded. Namely, to those equations with an irregular singular point such that the asymptotics of solutions of the original equation in the Laplace-Borel images contain exponentials in whose exponents there are polynomials of a fractional degree of the variable. The application of the obtained results to an equation of this type is illustrated by a specific example.</trans-abstract>
      <kwd-group xml:lang="ru">
        <kwd>асимптотики решений</kwd>
        <kwd>иррегулярные особенности</kwd>
        <kwd>ресургентный анализ</kwd>
        <kwd>преобразование Лапласа - Бореля</kwd>
        <kwd>метод повторного квантования</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <kwd>asymptotics of solutions</kwd>
        <kwd>irregular singularities</kwd>
        <kwd>resurgent analysis</kwd>
        <kwd>Laplace--Borel transform</kwd>
        <kwd>requantization method</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <back>
    <ref-list>
      <ref id="R1">
        <label>1</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V., Smirnov V. Yu. Requantization method and its application to the construction of asymptotics for solutions of non-Fuchsian equations with holomorphic coefficients // J. Math. Sci. 2022. Vol. 268, № 1. P. 70-83. DOI: 10.1007/s10958-022-06181-4.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. and Smirnov, V. Yu. Requantization Method and Its Application to the Construction of Asymptotics for Solutions of Non-Fuchsian Equations with Holomorphic Coefficients, Journal of Mathematical Sciences, 2022, vol. 268, no. 1, pp. 70-83. DOI: 10.1007/s10958-022-06181-4.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R2">
        <label>2</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V. Repeated quantization method and its applications to the construction of asymptotics of solutions of equations with degeneration // Diff. Equat. 2016. Vol. 52, № 1. P. 58-75. DOI: 10.1134/S0012266116010055.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. Repeated Quantization Method and Its Applications to the Construction of Asymptotics of Solutions of Equations with Degeneration, Differential Equations, 2016, vol. 52, no. 1, pp. 58-75. DOI: 10.1134/S0012266116010055.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R3">
        <label>3</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Poincare H. Sur les integrales irregulieres: Des equations lineaires // Acta Math. 1886. Vol. 8. P. 295-344. DOI: 10.1007/BF02417092.</mixed-citation>
          <mixed-citation xml:lang="en">Poincare, H. Sur les Integrales Irregulieres: Des Equations Lineaires, Acta Mathematica, 1886, vol. 8, pp. 295-344. DOI: 10.1007/BF02417092.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R4">
        <label>4</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Poincare H. Analysis of the mathematical and natural works of Henri Poincare. In Selected works in three volumes. Vol. 3. Mathematics. Theoretical physics. Moscow: Nauka, 1974.</mixed-citation>
          <mixed-citation xml:lang="en">Poincare, H. Analysis of the Mathematical and Natural Works of Henri Poincare, In Selected Works in Three Volumes, vol. $3$. Mathematics. Theoretical Physics, Moscow, Nauka, 1974.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R5">
        <label>5</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V. {Asymptotics of solutions of linear differential equations with holomorphic coefficients in the neighborhood of an infinitely distant point // MDPI Mathematics. 2020. Vol. 8, № 12. P. 1-15. DOI: 10.3390/math8122249.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. Asymptotics of Solutions of Linear Differential Equations with Holomorphic Coefficients in the Neighborhood of an Infinitely Distant Point, MDPI Mathematics, 2020, vol. 8, no. 12, pp. 1-15. DOI: 10.3390/math8122249.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R6">
        <label>6</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V. Uniform asymptotics of solutions of the linear differential equations with holomorphic coefficients in a neighborhood of an infinitely // Lobachevskii J. Math. 2023. Vol. 44, № 7. P. 2765-2780. DOI: 10.1134/S1995080223070260.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. Uniform Asymptotics of Solutions of the Linear Differential Equations with Holomorphic Coefficients in a Neighborhood of an Infinitely, Lobachevskii Journal of Mathematics, 2023, vol. 44, no. 7, pp. 2765-2780. DOI: 10.1134/S1995080223070260.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R7">
        <label>7</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Кац Д. С. Вычисление асимптотик решений уравнений с полиномиальными вырождениями коэффициентов // Дифференц. уравнения. 2015. Т. 51, № 12. С. 1612-1617. DOI: 10.1134/s0374064115120067.</mixed-citation>
          <mixed-citation xml:lang="en">Kats, D. S. Computation of the Asymptotics of Solutions for Equations with Polynomial Degeneration of the Coefficients, Differential Equations, 2015, vol. 51, no. 12, pp. 1589-1594. DOI: 10.1134/S001226611512006X.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R8">
        <label>8</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Kондратьев В. А. Краевые задачи для эллиптических уравнений в областях с коническими или угловыми точками // Тр. Московского мат. об-ва. 1967. Т. 16. C. 209-292.</mixed-citation>
          <mixed-citation xml:lang="en">Kondrat'ev, V. A. Boundary Value Problems for Elliptic Equations in Domains with Conical or Angular Points, Trudy Moskovskogo Matematicheskogo Obshchestva [Proceedings of Moscow Mathematical Society], 1967, vol. 16, pp. 209-292 (in Russian).</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R9">
        <label>9</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V., Shatalov V. E. Differential equations with degeneration and resurgent analysis // Diff. Equat. 2010. Vol. 46, № 9. P. 1267-1286. DOI: 10.1134/S0012266110090041.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. and Shatalov, V. E. Differential Equations with Degeneration and Resurgent Analysis, Differential Equations, 2010, vol. 46, no. 9, pp. 1267-1286. DOI: 10.1134/S0012266110090041.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R10">
        <label>10</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V., Matevossian H. A. Uniform asymptotics of solutions of second-order differential equations with meromorphic coefficients in a neighborhood of singular points and their applications // MDPI Mathematics. 2022. Vol. 10, № 14. P. 1-21. DOI: 10.3390/math10142465.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. and Matevossian, H. A. Uniform Asymptotics of Solutions of Second-Order Differential Equations with Meromorphic Coefficients in a Neighborhood of Singular Points and Their Applications, MDPI Mathematics, 2022, vol. 10, no. 14, pp. 1-21. DOI: 10.3390/math10142465.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R11">
        <label>11</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Korovina M. V. Application of the repeated quantization method to the problem of making asymptotic solutions of equations with holomorphic coefficients // International Journal of Open Information Technologies. 2019. Vol. 7, № 9. P. 14-22.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V. Application of the Repeated Quantization Method to the Problem of Making Asymptotic Solutions of Equations with Holomorphic Coefficients, International Journal of Open Information Technologies, 2019, vol. 7, no. 9, pp. 14-22.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R12">
        <label>12</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Ecalle J. Cinq Applications des Fonctions Resurgentes. Paris: Prepublications Mathematiques d’Orsay, 1984.-110 p.</mixed-citation>
          <mixed-citation xml:lang="en">Ecalle, J. Cinq Applications des Fonctions Resurgentes, Paris, France, Prepublications Mathematiques d’Orsay, 1984.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R13">
        <label>13</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Sternin B. Yu., Shatalov V. E. Borel-Laplace Transform and Asymptotic Theory: Introduction to Resurgent Analysis. Boca Raton, FL.: CRC Press, 1996.</mixed-citation>
          <mixed-citation xml:lang="en">Sternin, B. Yu. and Shatalov, V. E. Borel-Laplace Transform and Asymptotic Theory. Introduction to Resurgent Analysis, Boca Raton, FL., CRC Press, 1996.</mixed-citation>
        </citation-alternatives>
      </ref>
      <ref id="R14">
        <label>14</label>
        <citation-alternatives>
          <mixed-citation xml:lang="ru">Коровина М. В. Асимптотики решений уравнений с высшими вырождениями // Дифференц. уравнения. 2012. Т. 48, № 5. C. 710-722.</mixed-citation>
          <mixed-citation xml:lang="en">Korovina, M. V.  Asymptotics of Solutions of Equations with Higher Degenerations, Differential Equations, 2012, vol. 48, no.  5, pp. 717-729. DOI: 10.1134/S0012266112050102.</mixed-citation>
        </citation-alternatives>
      </ref>
    </ref-list>
  </back>
</article>
