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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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2021-22-3-311-344</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1094</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>История математики и приложений</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Сomputer science</subject></subj-group></article-categories><title-group><article-title>О развитии нелинейных интегральных уравнений на раннем этапе и вкладе отечественных математиков</article-title><trans-title-group xml:lang="en"><trans-title>On the development of nonlinear integral equations at the early stage and the contribution of domestic mathematics</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>Богатов</surname><given-names>Егор Михайлович</given-names></name><name name-style="western" xml:lang="en"><surname>Bogatov</surname><given-names>Egor Mikhailovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">embogatov@inbox.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>Мухин</surname><given-names>Равиль Рафкатович</given-names></name><name name-style="western" xml:lang="en"><surname>Mukhin</surname><given-names>Ravil’ Rafkatovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences</p></bio><email xlink:type="simple">mukhiny@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Филиал Национального исследовательского технологического университета «МИСИС» в г. Губкине Белгородской&#13;
области; Старооскольский технологический институт им. А. А. Угарова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research University of Science and Technology “MISIS” in Gubkin town of Belgorod Region; &#13;
Stary Oskol National Research University of Science and Technology “MISIS”</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Старооскольский технологический институт им. А. А. Угарова (филиал) Национального исследовательского технологического университета «МИСиС»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ugarov Stary Oskol Technological Institute (branch) of National University of Science and Technology «MISiS»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>12</day><month>11</month><year>2021</year></pub-date><volume>22</volume><issue>3</issue><fpage>311</fpage><lpage>344</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Богатов Е.М., Мухин Р.Р., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Богатов Е.М., Мухин Р.Р.</copyright-holder><copyright-holder xml:lang="en">Bogatov E.M., Mukhin R.R.</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://www.chebsbornik.ru/jour/article/view/1094">https://www.chebsbornik.ru/jour/article/view/1094</self-uri><abstract><p>В работе рассмотрены предпосылки и зарождение теории нелинейных интегральных уравнений. Появление этой теории явилось закономерным следствием развития всей ма-тематики XVIII-XIX вв. Вместе с тем сильное мотивирующее воздействие оказало возрастание интереса к нелинейным задачам в конце XIX – начале XX в. Непосредственноеисследование конкретных нелинейных интегральных уравнений было вызвано актуальной прикладной задачей о фигурах равновесия вращающихся жидких масс, которая, начиная с Ньютона, привлекала внимание значительного числа крупнейших математиков. В первые десятилетия развития теории нелинейных интегральных уравнений культивировались традиционные подходы, использовавшиеся для исследования дифференциальных и алгебраических уравнений, по схеме уравнение-решение. То есть на первом плане находилось вычисление и оценка его точности. Сложность и своеобразие нелинейных задач сразу выявили актуальность вопросов существования и единственности их решений, что сделалонеобходимым привлечение других, только создающихся областей математики. Теория интегральных уравнений вообще явилась одним из истоков функционального анализа. Кроме того, обе теории тесно переплетались и в своей эволюции взаимно стимулировали друг друга. В полной мере это относится и к нелинейным интегральным уравнениям, для которых первостепенное значение приобрели качественные методы. На рассматриваемом в настоящей работе этапе имело место параллельное развитие и cмешение традиционных методов исследования уравнений и новых подходов качественного характера. На следующем этапеновые подходы вышли на первый план, объединившись с функциональным анализом и топологией.</p></abstract><trans-abstract xml:lang="en"><p>The paper considers the preconditions and the origin of the theory of nonlinear integral equations. The appearance of this theory was a natural consequence of the development of allmathematics of the XVIII-XIX cc. At the same time, the growing interest in nonlinear problems in the late XIX and early XX centuries had a strong motivating effect. The direct investigationof specific nonlinear integral equations was triggered by an urgent applied problem on the equilibrium figures of rotating liquid masses, which has attracted a significant number of majormathematicians since Newton. In the first decades of the development of the theory of nonlinear integral equations, traditional approaches were cultivated, which were used to study differential and algebraic equations, according to the equation-solution scheme. That is, the foreground was the calculation and assessment of its accuracy. The complexity and originality of nonlinear problems immediately revealed the relevance of questions of the existence and uniqueness of their solutions, which made it necessary to involve other, just emerging areas of mathematics. The theory of integral equations in general was one of the origins of functional analysis. Moreover, both theories were closely intertwined and mutually stimulated each other in their evolution. This fully applies to nonlinear integral equations, for which qualitative methods have become of paramount importance. At the stage considered in this work, there was a parallel development and mixing of traditional methods for studying equations and new approaches of a qualitativenature. In the next phase, new approaches came to the fore, merging with functional analysis and topology.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>нелинейные интегральные уравнения</kwd><kwd>уравнение Клеро</kwd><kwd>уравнение Радо</kwd><kwd>уравнение Лиувилля</kwd><kwd>уравнение Ляпунова-Шмидта</kwd><kwd>уравнение Урысона</kwd><kwd>уравнение Некрасова</kwd><kwd>уравнение Гаммерштейна</kwd><kwd>А. Пуанкаре</kwd><kwd>Н.Н. Назаров.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nonlinear integral equations</kwd><kwd>Clairaut equation</kwd><kwd>Radau equation</kwd><kwd>Liouville equation</kwd><kwd>Lyapunov-Schmidt equation</kwd><kwd>Urysohn equation</kwd><kwd>Nekrasov equation</kwd><kwd>Hammerstein equation</kwd><kwd>A. Poincar´e</kwd><kwd>N.N. Nazarov.</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">Abel N.H. Solution de quelques probl`emes `a l’aide d’int´egrales d´efinies // Magazin Naturvidensk, Vol. 1 (1823), pp. 55–68.</mixed-citation><mixed-citation xml:lang="en">Abel, N.H. 1823, “Solution de quelques probl`emes `a l’aide d’int´egrales d´efinies”, Magazin Naturvidensk., vol. 1, pp. 55–68. 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