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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">matatecs</journal-id><journal-title-group><journal-title xml:lang="ru">Математика и теоретические компьютерные науки</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematics and Theoretical Computer Science</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-3919</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/2949-3919.2025.4.4-18</article-id><article-id custom-type="elpub" pub-id-type="custom">matatecs-92</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 топологической сопряженности квадратичных отображений в неограниченных областях</article-title><trans-title-group xml:lang="en"><trans-title>About topological conjugacy of quadratic maps in unbounded domains</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>Бельмесова</surname><given-names>С. С</given-names></name><name name-style="western" xml:lang="en"><surname>Belmesova</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Светлана Сергеевна Бельмесова</p><p>пр-т Гагарина, д. 23, г. Нижний Новгород, 603022</p></bio><bio xml:lang="en"><p>Svetlana Sergeevna Belmesova</p><p>23 Gagarin ave., Nizhny Novgorod 603022</p></bio><email xlink:type="simple">belmesovass@mail.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>Ефремова</surname><given-names>Л. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Efremova</surname><given-names>L. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Людмила Сергеевна Ефремова</p><p>пр-т Гагарина, д. 23, г. Нижний Новгород, 603022</p><p>Институтский переулок, д. 9, г. Долгопрудный, Московская область,</p></bio><bio xml:lang="en"><p>Lyudmila Sergeevna Efremova</p><p>23 Gagarin ave., Nizhny Novgorod 603022</p><p>9 Institutskii alley, Dolgoprudny, Moscow Region, 141701</p></bio><email xlink:type="simple">ludmila.efremova@itmm.unn.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Нижегородский государственный университет им. Н.И. Лобачевского</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lobachevskii Nizgny Novgorod State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Нижегородский государственный университет им. Н.И. Лобачевского; Московский физико-технический институт (университет)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lobachevskii Nizgny Novgorod State University; Moscow Institute of Physics and Technology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>05</day><month>02</month><year>2026</year></pub-date><volume>3</volume><issue>4</issue><fpage>4</fpage><lpage>18</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бельмесова С.С., Ефремова Л.С., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Бельмесова С.С., Ефремова Л.С.</copyright-holder><copyright-holder xml:lang="en">Belmesova S.S., Efremova L.S.</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://matatecs.elpub.ru/jour/article/view/92">https://matatecs.elpub.ru/jour/article/view/92</self-uri><abstract><p>Установлена попарная топологическая сопряженность в некоторых неограниченных подмножествах плоскости R2 следующих квадратичных отображений: F(x, y) = 􀀀 xy, (x − 2)2 , Лотки–Вольтерра L(x, y) = (x (4 − x − y), xy) и H(x, y) = 􀀀 y2, xy − 2x + 2 , возникающего при изучении коэффициентов отражения и прохождения плоской волны с заданным импульсом в поле квазикристаллической решетки. С помощью установленной топологической сопряженности и предыдущих результатов авторов о блуждающих точках отображения F дано описание множества тех блуждающих точек отображений L и H, которые лежат в выделенных неограниченных областях.</p></abstract><trans-abstract xml:lang="en"><p>Pairwise topological conjugacy in some unbounded domains of the plane R2 of the quadratic map F(x, y) = 􀀀 xy, (x − 2)2 , the Lotka-Volterra map L(x, y) = (x(4 − x − y), xy) and the map H(x, y) = (y2, xy − 2x + 2), which arises in studying of the reflection and transmission coefficients of a plane wave with a given momentum in the field of a quasicrystalline lattice is proved in this paper. Using previous author’s results on the wandering points of the map F and the result of the paper we give a description of the set of wandering points of the maps L and H.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>топологическая сопряженность</kwd><kwd>блуждающая точка</kwd><kwd>квадратичное отображение</kwd><kwd>отображение следа</kwd><kwd>квазикристаллическая решетка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>topological conjugacy</kwd><kwd>wandering point</kwd><kwd>quadratic map</kwd><kwd>trace map</kwd><kwd>quasicrystalline lattice</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">F. Balibrea, J.L. Garc´ia Guirao, M. Lampart, J. Llibre, Dynamics of a Lotka–Volterra map, Fund. Math. 191 (3), 265–279 (2006). DOI: https://doi.org/10.4064/fm191-3-5</mixed-citation><mixed-citation xml:lang="en">F. Balibrea, J.L. Garc´ia Guirao, M. Lampart, J. 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