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(PDF) On the uniform convergence of Fourier transforms on groups | Constantine Georgakis - Academia.edu

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class="ds-related-work--container js-wsj-grid-card" data-collection-position="0" data-entity-id="16400216" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/16400216/On_Twisted_Fourier_Analysis_and_Convergence_of_Fourier_Series_on_Discrete_Groups">On Twisted Fourier Analysis and Convergence of Fourier Series on Discrete Groups</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="35538661" href="https://uniroma1.academia.edu/RobertoConti">Roberto Conti</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Fourier Analysis and Applications, 2009</p><p class="ds-related-work--abstract ds2-5-body-sm">We study norm convergence and summability of Fourier series in the setting of reduced twisted group C * -algebras of discrete groups. 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class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="58405037" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/58405037/Functions_that_operate_in_the_Fourier_algebra_of_a_compact_group">Functions that operate in the Fourier algebra of a compact group</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="39545224" href="https://independent.academia.edu/CharlesDunkl">Charles Dunkl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Proceedings of the American Mathematical Society, 1969</p><p class="ds-related-work--abstract ds2-5-body-sm">Only real-analytic functions operate in the Fourier algebra of any compact group that has an infinite abelian subgroup. This extends the theorems of Helson, Kahane, Katznelson, and Rudin [4] which apply to the algebra of absolutely convergent Fourier series on compact abelian groups. The Fourier algebra of a locally compact group has been studied by H. Mirkil [ó], W. F. Stinespring [9], R. A. Mayer [5], C. Herz [3], and most thoroughly by P. Eymard [l]. We will state here the relevant definitions and facts, and prove that the restriction of the Fourier algebra to a closed subgroup is the Fourier algebra of the subgroup, and use this to lift up the theorem on operating functions.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Functions that operate in the Fourier algebra of a compact group&quot;,&quot;attachmentId&quot;:72838146,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/58405037/Functions_that_operate_in_the_Fourier_algebra_of_a_compact_group&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/58405037/Functions_that_operate_in_the_Fourier_algebra_of_a_compact_group"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="109451115" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/109451115/Fundamental_Theorems_of_Fourier_Stieltjes_Transform_Defined_by_Induced_Representation_on_Locally_Compact_Group">Fundamental Theorems of Fourier-Stieltjes Transform Defined by Induced Representation on Locally Compact Group</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="137244740" href="https://independent.academia.edu/Hounkonnou">Norbert Hounkonnou</a></div><p class="ds-related-work--metadata ds2-5-body-xs">arXiv (Cornell University), 2022</p><p class="ds-related-work--abstract ds2-5-body-sm">This work addresses an extension of Fourier-Stieltjes transform of a vector measure defined on compact groups to locally compact groups, by using a group representation induced by a representation of one of its compact subgroups.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Fundamental Theorems of Fourier-Stieltjes Transform Defined by Induced Representation on Locally Compact Group&quot;,&quot;attachmentId&quot;:107572730,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/109451115/Fundamental_Theorems_of_Fourier_Stieltjes_Transform_Defined_by_Induced_Representation_on_Locally_Compact_Group&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/109451115/Fundamental_Theorems_of_Fourier_Stieltjes_Transform_Defined_by_Induced_Representation_on_Locally_Compact_Group"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="126166707" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/126166707/On_Sj%C3%B6lin_Soria_Antonov_type_extrapolation_for_locally_compact_groups_and_a_e_convergence_of_Vilenkin_Fourier_series">On Sjölin–Soria–Antonov type extrapolation for locally compact groups and a.e. convergence of Vilenkin–Fourier series</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="298744359" href="https://independent.academia.edu/GiorgiOniani7">Giorgi Oniani</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Acta Mathematica Hungarica</p><p class="ds-related-work--abstract ds2-5-body-sm">Sjölin-Soria-Antonov type extrapolation theorem for locally compact σ-compact non-discrete groups is proved. As an application of this result it is shown that the Fourier series with respect to the Vilenkin orthonormal systems on the Vilenkin groups of bounded type converge almost everywhere for functions from the class L log + L log + log + log + L. Let (X, µ) be a measure space. Denote by: • L 0 (X, µ) the class of all measurable functions f : X → [−∞, ∞]; • Φ the set of all increasing continuous functions ϕ : [0, ∞) → [0, ∞) with ϕ(0) = 0 and lim inf u→∞ ϕ(u)/u &gt; 0; • ϕ(L)(X, µ) the class of all measurable functions f : X → [−∞, ∞] for which X ϕ(|f |)dµ &lt; ∞; • χ E the characteristic function of a set E ⊂ X.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;On Sjölin–Soria–Antonov type extrapolation for locally compact groups and a.e. convergence of Vilenkin–Fourier series&quot;,&quot;attachmentId&quot;:120085344,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/126166707/On_Sj%C3%B6lin_Soria_Antonov_type_extrapolation_for_locally_compact_groups_and_a_e_convergence_of_Vilenkin_Fourier_series&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/126166707/On_Sj%C3%B6lin_Soria_Antonov_type_extrapolation_for_locally_compact_groups_and_a_e_convergence_of_Vilenkin_Fourier_series"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="51635678" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/51635678/Motion_Groups_and_Absolutely_Convergent_Fourier_Transforms">Motion Groups and Absolutely Convergent Fourier Transforms</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="42712098" href="https://independent.academia.edu/RitaPini">Rita Pini</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of the Australian Mathematical Society, 1987</p><p class="ds-related-work--abstract ds2-5-body-sm">According to an extension of a classical theorem of Bernstein, due to C. Herz, a function on R&quot; belonging to a Besov space of appropriate order has an absolutely convergent Fourier transform. We establish extensions of this result to Cartan motion groups, for Besov spaces defined with respect to both isotropic and non-isotropic differences.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Motion Groups and Absolutely Convergent Fourier Transforms&quot;,&quot;attachmentId&quot;:69273353,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/51635678/Motion_Groups_and_Absolutely_Convergent_Fourier_Transforms&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/51635678/Motion_Groups_and_Absolutely_Convergent_Fourier_Transforms"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="49544872" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/49544872/Multipliers_on_spaces_of_functions_on_compact_groups_with_p_summable_Fourier_transforms">Multipliers on spaces of functions on compact groups with p-summable Fourier transforms</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="152333134" href="https://independent.academia.edu/sanjivgupta21">sanjiv gupta</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Bulletin of the Australian Mathematical Society, 1993</p><p class="ds-related-work--abstract ds2-5-body-sm">Let G be a compact abelian group with dual group Γ. For 1 ≤ p &amp;lt; ∞, denote by Ap(G) the space of integrable functions on G whose Fourier transforms belong to lp(Γ). We investigate several problems related to multipliers from Ap(G) to Aq(G). In particular, we prove that (Ap, Ap) ⊊ (Aq, Aq). For the circle group, we characterise permutation invariant multipliers from Ap to Ar for 1 ≤ r ≤ 2.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Multipliers on spaces of functions on compact groups with p-summable Fourier transforms&quot;,&quot;attachmentId&quot;:67873285,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/49544872/Multipliers_on_spaces_of_functions_on_compact_groups_with_p_summable_Fourier_transforms&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/49544872/Multipliers_on_spaces_of_functions_on_compact_groups_with_p_summable_Fourier_transforms"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;continue-reading-button--sticky-ctas&quot;,&quot;attachmentId&quot;:90714653,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;workUrl&quot;:null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;download-pdf-button--sticky-ctas&quot;,&quot;attachmentId&quot;:90714653,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;workUrl&quot;:null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_90714653" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="50524891" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/50524891/An_Lp_Lq_version_of_Hardys_theorem_for_spherical_Fourier_transform_on_semisimple_Lie_groups">An Lp−Lq version of Hardy&#39;s theorem for spherical Fourier transform on semisimple Lie groups</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="169922083" href="https://independent.academia.edu/SlaimBenFarah">Slaim Ben Farah</a></div><p class="ds-related-work--metadata ds2-5-body-xs">International 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class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="2" data-entity-id="126166706" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/126166706/On_Sj_o_lin_Soria_Antonov_type_extrapolation_for_locally_compact_groups">On Sj\&quot;{o}lin-Soria-Antonov type extrapolation for locally compact groups</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="298744359" href="https://independent.academia.edu/GiorgiOniani7">Giorgi Oniani</a></div><p class="ds-related-work--metadata ds2-5-body-xs">arXiv (Cornell University), 2020</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;On 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data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/58405031/Existence_and_nonuniqueness_of_invariant_means_on_mathcal_L_infty_hat_G_">Existence and nonuniqueness of invariant means on $\mathcal{L}^\infty(\hat G)$</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="39545224" href="https://independent.academia.edu/CharlesDunkl">Charles Dunkl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Proceedings of the American Mathematical Society, 1972</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Existence and nonuniqueness of invariant means on $\\mathcal{L}^\\infty(\\hat 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Groups&quot;,&quot;attachmentId&quot;:94031536,&quot;attachmentType&quot;:&quot;pdf&quot;,&quot;work_url&quot;:&quot;https://www.academia.edu/90479764/The_Norm_of_the_Fourier_Transform_on_Compact_or_Discrete_Abelian_Groups&quot;,&quot;alternativeTracking&quot;:true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/90479764/The_Norm_of_the_Fourier_Transform_on_Compact_or_Discrete_Abelian_Groups"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="5" data-entity-id="109640985" data-sort-order="default"><a class="ds-related-work--title 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II</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="63569879" href="https://independent.academia.edu/RichardDMosak">Richard D . Mosak</a></div><p class="ds-related-work--metadata ds2-5-body-xs">1973</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{&quot;location&quot;:&quot;wsj-grid-card-download-pdf-modal&quot;,&quot;work_title&quot;:&quot;Duality and harmonic analysis on central topological groups. 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