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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">28995</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2021-67-3-472-482</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 Holder’s Inequality in Lebesgue Spaces with Variable Order of Summability</article-title><trans-title-group xml:lang="ru"><trans-title>О неравенстве Гельдера в лебеговых пространствах с переменным порядком суммируемости</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Burenkov</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Буренков</surname><given-names>В. И.</given-names></name></name-alternatives><email>Burenkov@cardiff.ac.uk</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tararykova</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Тарарыкова</surname><given-names>Т. В.</given-names></name></name-alternatives><email>tararykovat@cardiff.ac.uk</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></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><aff id="aff2"><institution>Cardiff University</institution></aff><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>472</fpage><lpage>482</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/28995">https://journals.rudn.ru/CMFD/article/view/28995</self-uri><abstract xml:lang="en"><p style="text-align: justify;">In this paper, we introduce a new version of the definition of a quasi-norm (in particular, a norm) in Lebesgue spaces with variable order of summability. Using it, we prove an analogue of Holder’s inequality for such spaces, which is more general and more precise than those known earlier.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В статье вводится новый вариант определения квази-нормы (в частности, нормы) в лебеговых пространствах с переменным порядком суммируемости и с его помощью доказывается аналог неравенства Гельдера для таких пространства, более общий и более точный по сравнению с известными ранее.</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Бандалиев Р. А. О структурных свойствах весового пространства Lp(x),ω для 0 &lt; p(x) № 1// Мат. заметки.- 2014.- 95, № 4. - C. 492-506.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Жиков В. В. Усреднение функционалов вариационного исчисления и теории упругости// Изв. АН СССР. Сер. 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