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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">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">22245</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2019-65-1-109-123</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>New Results</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Новые результаты</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">Spectra of the Energy Operator of Three-Electron Systems in the Impurity Hubbard Model.Second Doublet State</article-title><trans-title-group xml:lang="ru"><trans-title>Спектр оператора энергии в трехэлектронных системах с примесью в модели Хаббарда.Второе дублетное состояние</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tashpulatov</surname><given-names>S M</given-names></name><name xml:lang="ru"><surname>Ташпулатов</surname><given-names>С М</given-names></name></name-alternatives><email>sadullatashpulatov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Nuclear Physics, Acad. Sci. of Uzbekistan</institution></aff><aff><institution xml:lang="ru">Институт ядерной физики АН Респ. Узбекистан</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>65</volume><issue>1</issue><issue-title xml:lang="en">Contemporary Problems in Mathematics and Physics</issue-title><issue-title xml:lang="ru">Современные проблемы математики и физики</issue-title><fpage>109</fpage><lpage>123</lpage><history><date date-type="received" iso-8601-date="2019-11-27"><day>27</day><month>11</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/22245">https://journals.rudn.ru/CMFD/article/view/22245</self-uri><abstract xml:lang="en">We consider the three-electron systems in the impurity Hubbard model and investigated the spectra of the system in the second doublet state in the ν-dimensional lattice Zν .</abstract><trans-abstract xml:lang="ru">В данной работе рассматриваются трехэлектронные системы с примесью в модели Хаббарда и исследуется спектр такой системы во втором дублетном состоянии в ν-мерной решетке Zν .</trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Изюмов Ю. А., Скрябин Ю. Н. Статистическая механика магнитоупорядоченных систем. - М.: Наука, 1987.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Карпенко Б. В., Дякин В. В., Будрина Г. Л. 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