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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">izvuzmath</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3446</issn><issn pub-type="epub">2076-4626</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/0021-3446-2024-10-77-89</article-id><article-id custom-type="elpub" pub-id-type="custom">izvuzmath-124</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>РАЗЛОЖЕНИЯ СОБСТВЕННЫХ ЗНАЧЕНИЙ ДИСКРЕТНОГО БИЛАПЛАСИАНА С ДВУМЕРНЫМ ВОЗМУЩЕНИЕМ</article-title><trans-title-group xml:lang="en"><trans-title>Expansions of eigenvalues of a discrete bilaplacian with two-dimensional perturbation</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>Расулов</surname><given-names>Т. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Rasulov</surname><given-names>T. Kh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тулкин Хусенович Расулов</p><p>ул. М. Икбол д. 11, г. Бухара, 200118</p></bio><bio xml:lang="en"><p>Tulkin Khusenovich Rasulov </p><p>11 M.Ikbol str., Bukhara, 200118</p></bio><email xlink:type="simple">t.h.rasulov@buxdu.uz</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>Халхужаев</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Khalkhuzhaev</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ахмад Мияссарович Халхужаев</p><p>Университетский бульвар, д. 15, г. Самарканд, 140104, </p><p>ул. Университетская, д. 9, г. Ташкент, 100174</p></bio><bio xml:lang="en"><p>Miyassarovich Khalkhuzhaev</p><p>15 University blvrd., Samarkand, 140104,</p><p>9 University str., Tashkent, 100174</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пардабаев</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Pardabaev</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мардон Алмуратович Пардабаев</p><p>ул. Спитамен, д. 166, г. Самарканд, 140104</p></bio><bio xml:lang="en"><p>Mardon Almuratovich Pardabaev </p><p>166 Spitamen str., Samarkand, 140104</p></bio><email xlink:type="simple">p_mardon75@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хайитова</surname><given-names>Х. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Khayitova</surname><given-names>Kh. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хилола Гафуровна Хайитова</p><p>ул  М. Икбол, д. 11, г. Бухара, 200118</p></bio><bio xml:lang="en"><p>Khilola Gafurovna Khayitova </p><p>11 M.Ikbol str., Bukhara, 200118</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Бухарский государственный университет</institution><country>Узбекистан</country></aff><aff xml:lang="en"><institution>Bukhara State University</institution><country>Uzbekistan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Самаркандский государственный университет им. Шарофа Рашидова;&#13;
Институт математики имени В.И. Романовского Академии наук Республики Узбекистан</institution><country>Узбекистан</country></aff><aff xml:lang="en"><institution>Samarkand State University after named Sharof Rashidov;&#13;
V.I. Romanovsky Institute of Mathematics of the Academy of Sciences of Uzbekistan</institution><country>Uzbekistan</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Узбекско-Финский педагогический институт</institution><country>Узбекистан</country></aff><aff xml:lang="en"><institution>Uzbek-Finnish Pedagogical Institute</institution><country>Uzbekistan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>09</day><month>11</month><year>2024</year></pub-date><volume>0</volume><issue>10</issue><fpage>77</fpage><lpage>89</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Расулов Т.Х., Халхужаев А.М., Пардабаев М.А., Хайитова Х.Г., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Расулов Т.Х., Халхужаев А.М., Пардабаев М.А., Хайитова Х.Г.</copyright-holder><copyright-holder xml:lang="en">Rasulov T.K., Khalkhuzhaev A.M., Pardabaev M.A., Khayitova K.G.</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://izvuzmath.elpub.ru/jour/article/view/124">https://izvuzmath.elpub.ru/jour/article/view/124</self-uri><abstract><p>Рассматривается семейство операторов Ḣµ: = ΔΔ - µ V, µ &gt; 0, т. е. билапласиан с конечномерным возмущением на одномерной решетке Z , где Δ — дискретный лапласиан, а V — оператор ранга два. Доказано, что для любого µ &gt; 0 дискретный спектр Hµ является двухэлементным e1(µ) &lt; 0 и e2(µ) &lt; 0. Находим сходящиеся разложения собственных значений ei(µ), i = 1, 2, в малой окрестности нуля при малых µ &gt; 0.</p></abstract><trans-abstract xml:lang="en"><p>In this paper we consider the family of operators μH:= ΔΔ— Vμ,     μ  &gt; 0, that is,  a bilaplacian with  a finite-dimensional perturbation on  a one-dimensional lattice  Z , where Δ  is  a  discrete  Laplacian,  and  Vμ   is  an  operator  of  rank  two.  It  is  proved  that  for  any  μ  &gt; 0 the discrete  spectrum  μH  is  two-element  e1(μ ) &lt; 0 and  e2(μ ) &lt; 0.  We find  convergent  expansions of the eigenvalues ei(μ ), i = 1, 2 in a small neighborhood of zero for small μ  &gt; 0.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>дискретный билапласиан</kwd><kwd>дискретный оператор Шрёдингера</kwd><kwd>существенный спектр</kwd><kwd>собственное значение</kwd><kwd>разложение</kwd><kwd>асимптотика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>discrete bilaplacian</kwd><kwd>discrete Schrodinger operator</kwd><kwd>essential spectrum</kwd><kwd>eigenvalue</kwd><kwd>expansion</kwd><kwd>asymptotics</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">McKenna P.J., Walter W. 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