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On pointwise a.e. convergence of multilinear operators

Part of: Harmonic analysis in several variables

Published online by Cambridge University Press:  29 May 2023

Loukas Grafakos ,
Danqing He ,
Petr Honzík Open the ORCID record for Petr Honzík [Opens in a new window]  and
Bae Jun Park
Loukas Grafakos
Affiliation:
Department of Mathematics, University of Missouri, Columbia, MO 65211, USA e-mail: grafakosl@umsystem.edu
Danqing He
Affiliation:
School of Mathematical Sciences, Fudan University, Shanghai, People’s Republic of China e-mail: hedanqing@fudan.edu.cn
Petr Honzík
Affiliation:
Department of Mathematics, Charles University, 116 36 Praha 1, Czech Republic e-mail: honzik@gmail.com
Bae Jun Park*
Affiliation:
Department of Mathematics, Sungkyunkwan University, Suwon 16419, Republic of Korea
*
e-mail: bpark43@skku.edu
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Abstract

In this work, we obtain the pointwise almost everywhere convergence for two families of multilinear operators: (a) the doubly truncated homogeneous singular integral operators associated with $L^q$ functions on the sphere and (b) lacunary multiplier operators of limited smoothness. The a.e. convergence is deduced from the $L^2\times \cdots \times L^2\to L^{2/m}$ boundedness of the associated maximal multilinear operators.

Keywords

Multilinear operatorsrough singular integral operatorlacunary maximal multiplier

MSC classification

Primary: 42B15: Multipliers
Secondary: 42B25: Maximal functions, Littlewood-Paley theory

Information

Type
Article
Information
Canadian Journal of Mathematics , Volume 76 , Issue 3 , June 2024 , pp. 1005 - 1032
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of The Canadian Mathematical Society

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Footnotes

D. He is supported by the National Key R&D Program of China (Grant No. 2021YFA1002500), the NNSF of China (Grant Nos. 11701583 and 12161141014), and the Natural Science Foundation of Shanghai (Grant No. 22ZR1404900). L. Grafakos would like to acknowledge the support of the Simons Fellows program (Grant No. 819503) and of the Simons Foundation grant 624733. P. Honzík is supported by the grant GAČR P201/21-01976S. B. Park is supported by the NRF grant 2022R1F1A1063637.

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