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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">28994</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2021-67-3-455-471</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">On Calculation of the Norm of a Monotone Operator in Ideal Spaces</article-title><trans-title-group xml:lang="ru"><trans-title>О вычислении нормы монотонного оператора в идеальных пространствах</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bakhtigareeva</surname><given-names>E. G.</given-names></name><name xml:lang="ru"><surname>Бахтигареева</surname><given-names>Э. Г.</given-names></name></name-alternatives><email>bakhtigareeva-eg@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goldman</surname><given-names>M. L.</given-names></name><name xml:lang="ru"><surname>Гольдман</surname><given-names>М. Л.</given-names></name></name-alternatives><email>seulydia@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>67</volume><issue>3</issue><issue-title xml:lang="en">Dedicated to 70th anniversary of the President of the RUDN University V. M. Filippov</issue-title><issue-title xml:lang="ru">Посвящается 70-летию президента РУДН В. М. Филиппова</issue-title><fpage>455</fpage><lpage>471</lpage><history><date date-type="received" iso-8601-date="2021-10-23"><day>23</day><month>10</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2021</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/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/28994">https://journals.rudn.ru/CMFD/article/view/28994</self-uri><abstract xml:lang="en"><p style="text-align: justify;">This paper contains the proof of general results on the calculation of the norms of monotone operators acting from one ideal space to another under matching convexity and concavity properties of the operator and the norms in ideal spaces.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Работа содержит доказательство общих результатов о вычислении норм монотонных операторов, действующих из одного идеального пространства в другое при условии согласования свойств выпуклости и вогнутости оператора и норм в идеальных пространствах.</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Канторович Л. 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