Failure of the Hörmander kernel condition for multilinear Calderón–Zygmund operators

Grafakos, Loukas; He, Danqing; Slavíková, Lenka

doi:10.1016/j.crma.2019.04.002

Harmonic analysis

Failure of the Hörmander kernel condition for multilinear Calderón–Zygmund operators
[Insuffisance de la condition de noyau de Hörmander pour les opérateurs multilinéaires de Calderón–Zygmund]

Présenté par : Yves Meyer

Grafakos, Loukas ¹ ; He, Danqing ² ; Slavíková, Lenka ¹

¹ Department of Mathematics, University of Missouri, Columbia MO 65211, USA
² Department of Mathematics Sun Yat-sen (Zhongshan) University, Guangzhou, Guangdong, China

Comptes Rendus. Mathématique, Tome 357 (2019) no. 4, pp. 382-388.

Résumé
Abstract

Il est bien connu que la condition de lissage de Hörmander $\sup_{y \neq 0} \int_{| x | \geq 2 | y |} | K (x - y) - K (x) | d x < \infty$ implique des estimations faibles de type $(1, 1)$ pour les opérateurs de Calderón–Zygmund $L^{2}$ -bornés. La question s'est alors posée de savoir si cette condition de Hörmander est également suffisante pour assurer des estimations faibles de type $(1, 1, 1 / 2)$ pour les opérateurs bilinéaires de Calderón–Zygmund qui sont bornés en un point. Nous donnons ici une réponse négative à cette question.

It is well known that the Hörmander smoothness condition $\sup_{y \neq 0} \int_{| x | \geq 2 | y |} | K (x - y) - K (x) | d x < \infty$ implies weak-type $(1, 1)$ estimates for associated $L^{2}$ -bounded Calderón–Zygmund operators. It has been an open question to know whether Hörmander's condition also suffices to guarantee weak-type $(1, 1, 1 / 2)$ estimates for bilinear Calderón–Zygmund operators that are bounded at one point. In this paper, we provide a negative answer to this question.

Reçu le : 2018-12-10
Accepté le : 2019-04-05
Publié le : 2019-04-01

DOI : 10.1016/j.crma.2019.04.002

Affiliations des auteurs :

Grafakos, Loukas ¹ ; He, Danqing ² ; Slavíková, Lenka ¹

¹ Department of Mathematics, University of Missouri, Columbia MO 65211, USA
² Department of Mathematics Sun Yat-sen (Zhongshan) University, Guangzhou, Guangdong, China

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     title = {Failure of the {H\"ormander} kernel condition for multilinear {Calder\'on{\textendash}Zygmund} operators},
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Grafakos, Loukas; He, Danqing; Slavíková, Lenka. Failure of the Hörmander kernel condition for multilinear Calderón–Zygmund operators. Comptes Rendus. Mathématique, Tome 357 (2019) no. 4, pp. 382-388. doi : 10.1016/j.crma.2019.04.002. http://www.numdam.org/articles/10.1016/j.crma.2019.04.002/

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Cité par Sources :

^☆ The first author was supported by the Simons Foundation (No. 315380). The second author was supported by the NNSF of China (No. 11701583), the Guangdong Natural Science Foundation (No. 2017A030310054) and the Fundamental Research Funds for the Central Universities (No. 17lgpy11).