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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">33543</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">K-gruppy Brunsa-Gubeladze dlya chetyrekhugol'noy piramidy</article-title><trans-title-group xml:lang="ru"><trans-title>K-группы Брунса-Губеладзе для четырехугольной пирамиды</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popelenskiy</surname><given-names>F. Yu.</given-names></name><name xml:lang="ru"><surname>Попеленский</surname><given-names>Ф. Ю.</given-names></name></name-alternatives><email>popelens@mech.math.msu.su</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Prikhod'ko</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Приходько</surname><given-names>М. В.</given-names></name></name-alternatives><email>anxieux@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en"></institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2013</year></pub-date><volume>51</volume><issue-title xml:lang="en">VOL 51, NO (2013)</issue-title><issue-title xml:lang="ru">ТОМ 51, № (2013)</issue-title><fpage>142</fpage><lpage>151</lpage><history><date date-type="received" iso-8601-date="2023-02-10"><day>10</day><month>02</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2013, Popelenskiy F.Y., Prikhod'ko M.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2013, Попеленский Ф.Ю., Приходько М.В.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="en">Popelenskiy F.Y., Prikhod'ko M.V.</copyright-holder><copyright-holder xml:lang="ru">Попеленский Ф.Ю., Приходько М.В.</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/33543">https://journals.rudn.ru/CMFD/article/view/33543</self-uri><abstract xml:lang="ru">В работе изучается относительно недавно построенное обобщение алгебраической Kтеории, в котором в качестве дополнительного параметра используется сбалансированный многогранник. Для четырехугольной пирамиды изучается соответствующая группа Стейнберга и вычисляются K-группы.</abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Васерштейн Л. Н. Основы алгебраической K-теории// Усп. мат. наук. - 1976. - 31, № 4. - С. 87-149.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Немытов А. И., Соловьев Ю. П. BN -пары и эрмитова K-теория. - Алгебра. Сб., посвящ. 90-лет. О. Ю. Шмидта. - М.: Изд. МГУ, 1982. - С. 102-118.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Немытов А. И., Соловьев Ю. П. Гомотопическое умножение в представляющем пространстве эрмитовой K-теории// Докл. АН СССР. - 1982. - 258, № 1. - С. 30-34.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Berrick A. J. An approach to algebraic K-theory. - London: Pitman, 1982.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Berrick A. J., Keating M. E. 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