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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8410</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Uniqueness and Stability of Solutions for Certain Linear Equations of the First Kind with Two Variables</article-title><trans-title-group xml:lang="ru"><trans-title>Единственность и устойчивость решений для некоторых интегральных уравнений первого рода с двумя независимыми переменными</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Asanov</surname><given-names>Avyt</given-names></name><name xml:lang="ru"><surname>Асанов</surname><given-names>Авыт</given-names></name></name-alternatives><email>avyt.asanov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kadenova</surname><given-names>Z A</given-names></name><name xml:lang="ru"><surname>Каденова</surname><given-names>Зууракан Ажимаматовна</given-names></name></name-alternatives><email>Kadenova71@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kyrgyz-Turkish University Manas</institution></aff><aff><institution xml:lang="ru">Кыргызско-Турецкий университет «Манас»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ministry of Education and Science of the Kyrgyz Republic</institution></aff><aff><institution xml:lang="ru">Министерство образования и науки Кыргызской республики</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2013</year></pub-date><issue>3</issue><issue-title xml:lang="en">NO3 (2013)</issue-title><issue-title xml:lang="ru">№3 (2013)</issue-title><fpage>30</fpage><lpage>35</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2013, Асанов А., Каденова З.А.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Асанов А., Каденова З.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8410">https://journals.rudn.ru/miph/article/view/8410</self-uri><abstract xml:lang="en">The article is devoted to the study of uniqueness and stability of solutions of linear integral equations of the first kind with two independent variables. The relevance of the problem is due to the needs in development of new approaches for the regularization and uniqueness of the solution of linear integral equations of the first kind with two independent variables. Integral and operator equations of the first kind with two independent variables arise in theoretical and applied problems.Works of A.N. Tikhonov, M.M. Lavrentyev and B.K. Ivanov, in which a new concept of correctness of setting such targets is given, different from the classical, show tools for research of ill-posed problems, which stimulated the interest to the integral equations that are of great practical importance. At the present time the theory and applications of ill-posed problems have been rapidly developing. One of the classes of such ill-posed problems are integral equations of the first kind with two independent variables. As of approximate solutions of such problems, stable to small variations of the initial data, we use the solutions derived by the method of regularization. In this article we prove the theorem of uniqueness and obtain estimates of stability for such equations in families of sets of correctnesses. For the tasks solution the methods of functional analysis and method of nonnegative quadratic forms are used. The results of the work are new.</abstract><trans-abstract xml:lang="ru">Статья посвящена исследованию единственности и устойчивости решений линейных интегральных уравнений первого рода с двумя независимыми переменными. Актуальность проблемы обусловлена потребностями в разработке новых подходов для регуляризации и единственности решения линейных интегральных уравнений первого рода с двумя независимыми переменными. Интегральные и операторные уравнения первого рода с двумя независимыми переменными возникают в теоретических и прикладных задачах. В работах А.Н. Тихонова, М.М. Лаврентьева и В.К. Иванова, в которых дано новое понятие корректности постановки таких задач, отличное от классического, показано средство для исследования некорректных задач, что стимулировало интерес к интегральным уравнениям, имеющим большое прикладное значение. В настоящее время бурно развивается теория и приложения некорректных задач. Один из классов таких некорректных задач составляют интегральные уравнения первого рода с двумя независимыми переменными. В статье доказано теорема единственности и получены оценки устойчивости для таких уравнений в семействах множеств корректностей. Для решения задачи использованы методы функционального анализа и метод неотрицательных квадратичных форм. Полученные результаты работы являются новыми.</trans-abstract><kwd-group xml:lang="en"><kwd>linear</kwd><kwd>inteqral equations</kwd><kwd>first kind</kwd><kwd>two variables</kwd><kwd>solution</kwd><kwd>uniqueness and stability</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>линейный</kwd><kwd>интегральные уравнения</kwd><kwd>первого рода</kwd><kwd>двух переменных</kwd><kwd>решение</kwd><kwd>единственность и устойчивость</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Aparstyn A.S. Nonclassical Linear Volterra Equations of the First Kind. — Utrecht: VSP, 2003.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Asanov A. Regularization, Uniqueness and Existence of Solutions of Volterra Equations of the First Kind. — Utrecht: VSP, 1998.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Bukhgeim A.L. 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