<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<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">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</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">35323</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2023-69-2-201-207</article-id><article-id pub-id-type="edn">CUFAAP</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">On the existence and uniqueness of a positive solution to a boundary-value problem of the Sturm-Liouville type for a nonlinear ordinary differential equation</article-title><trans-title-group xml:lang="ru"><trans-title>О существовании и единственности положительного решения краевой задачи типа Штурма-Лиувилля для одного нелинейного обыкновенного дифференциального уравнения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abduragimov</surname><given-names>G. E.</given-names></name><name xml:lang="ru"><surname>Абдурагимов</surname><given-names>Г. Э.</given-names></name></name-alternatives><email>gusen_e@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abduragimova</surname><given-names>P. E.</given-names></name><name xml:lang="ru"><surname>Абдурагимова</surname><given-names>П. Э.</given-names></name></name-alternatives><email>abpatuka@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuramagomedova</surname><given-names>M. M.</given-names></name><name xml:lang="ru"><surname>Курамагомедова</surname><given-names>М. М.</given-names></name></name-alternatives><email>madina19.12@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Daghestan State University</institution></aff><aff><institution xml:lang="ru">Дагестанский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-06-30" publication-format="electronic"><day>30</day><month>06</month><year>2023</year></pub-date><volume>69</volume><issue>2</issue><issue-title xml:lang="en">Proceedings of the Crimean Autumn Mathematical School-Symposium</issue-title><issue-title xml:lang="ru">Труды Крымской осенней математической школы-симпозиума</issue-title><fpage>201</fpage><lpage>207</lpage><history><date date-type="received" iso-8601-date="2023-07-10"><day>10</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Abduragimov G.E., Abduragimova P.E., Kuramagomedova M.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Абдурагимов Г.Э., Абдурагимова П.Э., Курамагомедова М.М.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Abduragimov G.E., Abduragimova P.E., Kuramagomedova M.M.</copyright-holder><copyright-holder xml:lang="ru">Абдурагимов Г.Э., Абдурагимова П.Э., Курамагомедова М.М.</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/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/35323">https://journals.rudn.ru/CMFD/article/view/35323</self-uri><abstract xml:lang="en"><p style="text-align: justify;">Using the fixed point theorem in partially ordered sets, we obtain sufficient conditions for the existence of a unique positive solution to a boundary-value problem of the Sturm-Liouville type for a nonlinear ordinary differential equation, and give an example illustrating the results obtained.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В работе с помощью теоремы о неподвижной точке в частично упорядоченных множествах получены достаточные условия существования единственного положительного решения краевой задачи типа Штурма-Лиувилля для одного нелинейного обыкновенного дифференциального уравнения; приведен пример, иллюстрирующий полученные результаты.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cone</kwd><kwd>positive solution</kwd><kwd>operator  xed point</kwd><kwd>Green’s function</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>конус</kwd><kwd>положительное решение</kwd><kwd>неподвижная точка оператора</kwd><kwd>функция Грина</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Абдурагимов Э.И. Положительное решение двухточечной краевой задачи для одного ОДУ четвертого порядка и численный метод его построения// Вестн. СамУ. Естественнонаучн. сер. -2010.- 76, № 2. -С. 5-12.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Абдурагимов Э.И. Существование положительного решения двухточечной краевой задачи для одного нелинейного ОДУ четвертого порядка// Вестн. СамУ. Естественнонаучн. сер. -2014.- 121, № 10.- С. 9-16.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Абдурагимов Э.И., Абдурагимова П.Э., Гаджиева Т.Ю. Двухточечная краевая задача для одного нелинейного ОДУ 4-го порядка. Существование, единственность положительного решения и численный метод его построения// Вестн. Даг. гос. ун-та. Сер. 1: Естеств. науки.-2019.- № 3.-С. 79-85.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Абдурагимов Г.Э., Абдурагимова П.Э., Курамагомедова М.М. О существовании и единственности положительного решения краевой задачи для нелинейного обыкновенного дифференциального уравнения четного порядка// Вестн. рос. ун-тов. Мат.- 2021.- 25, № 136.- С. 341-347.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Cabada A., Iglesias J. Nonlinear differential equations with perturbed Dirichlet integral boundary conditions// Bound. Value Probl.- 2021.- 66.-C. 1-19.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Harjani J., Sadarangani K. Fixed point theorems for weakly concractive mappings in partially ordered sets// Nonlinear Anal. -2009.-71.-C. 3403-3410.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Li Z., Shu X.-B., Miao T. The existence of solutions for Sturm-Liouville differential equation with random impulses and boundary value problems// Bound. Value Probl.- 2022.- 97.- C. 1-23.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Liu Y. Multiple positive of nonlinear singular boundary value problem for fourth-order equations// Appl. Math. Lett. -2004.-4.- C. 747-757.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Moustafa El-S. Positive solutions of boundary value problems for nth-order ordinary differential equations// Electron. J. Qual. Theory Differ. Equ. - 2008.- 1.- C. 1-9.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Nietto J.J., Rodriguez-Lopez R. Contractive mapping theorems in partially ordered sets and applications to ordinary differential equations// Order.- 2005.-22.-C. 223-239.</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>Talib I., Abdeljawad T., Abdulah M.A. New results and applications on the existence results for nonlinear coupled systems// Adv. Differ. Equ. - 2021.- 368.-C. 1-22.</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Wang F., Ding R. On positive solutions of second-order delayed differential system with indefinite weight// Bound. Value Probl.- 2021.- 96.-C. 1-17.</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Yang Z. Positive solutions of a second-order nonlinear Robin problem involving the first-order derivative// Adv. Differ. Equ. -2021.-313.- C. 1-16.</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>Ying H. Existence theory for single positive solution to fourth-order value problems// Adv. Pure Math.- 2014.-4.- C. 480-486.</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Zhang Y., Abdella K., Feng W. Positive solutions for second-order differential equations with singularities and separated integral boundary condition// Electron. J. Qual. Theory Differ. Equ. -2020.- 75.- C. 1- 12.</mixed-citation></ref></ref-list></back></article>
