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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">24427</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2020-66-2-221-271</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">Symmetric Spaces of Measurable Functions: Old and New Advances</article-title><trans-title-group xml:lang="ru"><trans-title>Симметричные пространства измеримых функций. Старые и новые достижения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Muratov</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Муратов</surname><given-names>М. А.</given-names></name></name-alternatives><email>mamuratov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rubshtein</surname><given-names>B.-Z. A.</given-names></name><name xml:lang="ru"><surname>Рубштейн</surname><given-names>Б. А.</given-names></name></name-alternatives><email>benzion@math.bgu.ac.il</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">V.I. Vernadsky Crimean Federal University</institution></aff><aff><institution xml:lang="ru">Крымский федеральный университет им. В. И. Вернадского</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ben-Gurion University of the Negev</institution></aff><aff><institution xml:lang="ru">Университет им. Д. Бен-Гуриона</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2020</year></pub-date><volume>66</volume><issue>2</issue><issue-title xml:lang="en">Proceedings of the Crimean Autumn Mathematical School-Symposium</issue-title><issue-title xml:lang="ru">Труды Крымской осенней математической школы-симпозиума</issue-title><fpage>221</fpage><lpage>271</lpage><history><date date-type="received" iso-8601-date="2020-08-25"><day>25</day><month>08</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2020</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/24427">https://journals.rudn.ru/CMFD/article/view/24427</self-uri><abstract xml:lang="en"><p>The article is an extensive review in the theory of symmetric spaces of measurable functions. It contains a number of new (recent) and old (known) results in this field. For the most of the results, we give their proofs or exact references, where they can be found. The symmetric spaces under consideration are Banach (or quasi-Banach) latices of measurable functions equipped with symmetric (rearrangement invariant) norm (or quasinorm). We consider symmetric spaces E = E(Ω, Fμ, μ) ⊂ L0 (Ω, Fμ, μ) on general measure spaces (Ω, Fμ, μ), where the measures μ are assumed to be finite or infinite σ-finite and nonatomic, while there are no assumptions that (Ω, Fμ, μ) is separable or Lebesgue space. In the first section of the review, we describe main classes and basic properties of symmetric spaces, consider minimal, maximal, and associate spaces, the properties (A), (B), and (C), and Fatou’s property. The list of specific symmetric spaces we use includes Orlicz LΦ(Ω, Fμ, μ), Lorentz ΛW (Ω, Fμ, μ), Marcinkiewicz MV (Ω, Fμ, μ), and Orlicz-Lorentz LW,Φ (Ω, Fμ, μ) spaces, and, in particular, the spaces Lp (w), Mp(w), Lp,q, and L∞(U ). In the second section, we deal with the dilation (Boyd) indexes of symmetric spaces and some applications of classical Hardy-Littlewood operator H. One of the main problems here is: when H acts as a bounded operator on a given symmetric space E(Ω, Fμ, μ)? A spacial attention is paid to symmetric spaces, which have Hardy-Littlewood property (HLP) or weak Hardy-Littlewood property (WHLP). In the third section, we consider some interpolation theorems for the pair of spaces (L1 , L∞) including the classical Calderon-Mityagin theorem. As an application of general theory, we prove in the last section of review Ergodic Theorems for Cesaro averages of positive contractions in symmetric spaces. Studying various types of convergence, we are interested in Dominant Ergodic Theorem (DET ), Individual (Pointwise) Ergodic Theorem (IET ), Order Ergodic Theorem (OET ), and also Mean (Statistical) Ergodic Theorem (MET ).</p></abstract><trans-abstract xml:lang="ru"><p>Статья представляет собой обширный обзор по теории симметричных пространств измеримых функций. Он содержит ряд новых (недавних) и старых (известных) результатов в этой области. Для большинства результатов мы приводим их доказательства или точные ссылки, где они могут быть найдены. Рассматриваемые симметричные пространства являются банаховыми (или квазибанаховыми) пространствами измеримых функций, снабженными симметричными (перестановочно инвариантными) нормами (или квазинормами). Мы рассматриваем симметричные пространства E = E(Ω, Fμ, μ) ⊂ L0 (Ω, Fμ, μ) на общих пространствах с мерой (Ω, Fμ, μ), причем меры μ предполагаются конечными или бесконечными σконечными неатомическими, в то же время не предполагается, что пространство с мерой (Ω, Fμ, μ) сепарабельно или является пространством Лебега. В первом разделе обзора мы описываем основные классы и основные свойства симметричных пространств, рассматриваем минимальные, максимальные, ассоциированные пространства, свойства (А), (B), (C) и свойство Фату (F). Список конкретных симметричных пространств, которые мы используем, включает в себя пространства Орлича LΦ(Ω, Fμ, μ), Лоренца ΛW (Ω, Fμ, μ), Марцинкевича MV (Ω, Fμ, μ), Орлича-Лоренца LW,Φ (Ω, Fμ, μ) и, в частности, пространства Lp(w), Mp(w), Lp,q и L∞(U ). Во втором разделе мы имеем дело с индексами растяжения (Бойда) симметричных пространств и некоторыми приложениями классического оператора H Харди-Литтлвуда. Одна изосновных проблем здесь заключается в следующем: когда H действует как ограниченный оператор на заданном симметричном пространстве E(Ω, Fμ, μ)? Особое внимание уделяется симметричным пространствам, которые обладают свойством Харди-Литтлвуда (HLP) или слабым свойством Харди-Литтлвуда (WHLP). В третьем разделе мы рассматриваем некоторые теоремы интерполяции для пары пространств (L1 , L∞), включая классическую теорему Кальдерона-Митягина. В качестве приложения общей теории в последнем разделе обзора мы доказываем эргодические теоремы для чезаровских средних положительных сжатий в симметричных пространствах. Изучая различные типы сходимости, мы делаем акцент на доминантной эргодической теореме (DET ), индивидуальной (поточечной) эргодической теореме (IET), порядковой эргодической теореме (OET ) и статистической (mean) эргодической теореме (MET).</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Браверман М. Ш., Меклер А. А. О свойстве Харди-Литтлвуда для симметричных пространств// Сиб. мат. ж. - 1977. - 18, № 3. - С. 522-540.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Векслер А. С. Эргодическая теорема в симметричных пространствах// Сиб. мат. ж. - 1985. - 26, № 4. - С. 189-191.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Векслер А. С. Статистические эргодические теоремы в симметричных пространствах. - Ташкент: Lambert Academic Publishing, 2018.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Векслер А. С., Федоров А. Л. 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