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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">matmess</journal-id><journal-title-group><journal-title xml:lang="ru">Математические заметки СВФУ</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematical notes of NEFU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2411-9326</issn><issn pub-type="epub">2587-876X</issn><publisher><publisher-name>Северо-Восточный федеральный университет имени М.К. Аммосова</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25587/2411-9326-2026-2-71-87</article-id><article-id custom-type="elpub" pub-id-type="custom">matmess-331</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>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>Обобщенная задача Самарского — Ионкина для уравнений соболевского типа нечетного порядка</article-title><trans-title-group xml:lang="en"><trans-title>Generalized Samarsky–Ionkin problem for Sobolev-type equations of odd order</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>Кожанов</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozhanov</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кожанов Александр Иванович</p><p>ул. Пирогова, 1, Новосибирск 630090</p></bio><bio xml:lang="en"><p>Alexandr I. Kozhanov</p><p>1 Pirogov Street, Novosibirsk 630090</p></bio><email xlink:type="simple">kozhanov@math.nsc.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>Тарасова</surname><given-names>Г. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Tarasova</surname><given-names>G. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тарасова Галина Ивановна</p><p>ул. Белинского, 58, Якутск 677000</p></bio><bio xml:lang="en"><p>Galina I. Tarasova</p><p>58 Belinsky Street, Yakutsk 677027</p></bio><email xlink:type="simple">gi-tarasova@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Новосибирский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Северо-Восточный федеральный университет имени М. К. Аммосова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>North-Eastern Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>10</day><month>06</month><year>2026</year></pub-date><volume>33</volume><issue>2</issue><fpage>71</fpage><lpage>87</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кожанов А.И., Тарасова Г.И., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Кожанов А.И., Тарасова Г.И.</copyright-holder><copyright-holder xml:lang="en">Kozhanov A.I., Tarasova G.I.</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://matmess.elpub.ru/jour/article/view/331">https://matmess.elpub.ru/jour/article/view/331</self-uri><abstract><p>Целью работы является исследование разрешимости нелокальных задач с обобщенным граничным условием Самарского — Ионкина для специального класса уравнений соболевского типа — именно, для уравнений, называемых псевдопараболическими уравнениями. Для изучаемых задач доказываются теоремы существования и единственности регулярных решений — решений, имеющих все обобщенные по С. Л. Соболеву производные, входящие в соответствующее уравнение. Описываются также некоторые усиления и обобщения полученных результатов.</p></abstract><trans-abstract xml:lang="en"><p>The work is investigating the solvability of nonlocal problems with the generalized Samarskii–Ionkin boundary condition for a special class of Sobolev-type equations, namely, for the so-called pseudoparabolic equations. We prove the existence and uniqueness theorems for regular solutions to the problems, i.e., for the solutions that have all generalized by Sobolev derivatives included in the corresponding equations. Moreover, some improvements and generalizations of the obtained results are described.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>псевдопараболические уравнения</kwd><kwd>нелокальные задачи</kwd><kwd>обобщенное условие Самарского — Ионкина</kwd><kwd>регулярные решения</kwd><kwd>существование</kwd><kwd>единственность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>pseudoparabolic equation</kwd><kwd>nonlocal problem</kwd><kwd>generalized Samarskii–Ionkin boundary condition</kwd><kwd>regular solution</kwd><kwd>existence</kwd><kwd>uniqueness</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Министерства науки и образования Российской Федерации, соглашение № 075-02-2026-1328, февраль 20, 2026.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ионкин Н. И. 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