ANNALES DE L'INSTITUT FOURIER

Littlewood-Paley decompositions and Fourier multipliers with singularities on certain sets
Annales de l'Institut Fourier, Volume 31 (1981) no. 1, pp. 157-175.

Let $E\subset \mathbf{R}$ be a closed null set. We prove an equivalence between the Littlewood-Paley decomposition in ${L}^{p}$ with respect to the complementary intervals of $E$ and Fourier multipliers of Hörmander-Mihlin and Marcinkiewicz type with singularities on $E$. Similar properties are studied in ${\mathbf{R}}^{2}$ for a union of rays from the origin. Then there are connections with the maximal function operator with respect to all rectangles parallel to these rays. In particular, this maximal operator is proved to be bounded on ${L}^{p}$, $1, when the rays form an iterated lacunary sequence.

Soit $E\subset \mathbf{R}$ un ensemble fermé de mesure nulle. On démontre une équivalence entre la décomposition de Littlewood-Paley dans ${L}^{p}$ par rapport aux intervalles complémentaires de $E$ et les multiplicateurs de Fourier du type de Hörmander-Mihlin et de Marcinkiewicz ayant des singularités sur $E$. Des propriétés analogues sont étudiées dans ${\mathbf{R}}^{2}$ pour une réunion de rayons partant de l’origine. Dans ce cas, on considère aussi la fonction maximale par rapport aux rectangles parallèles à ces rayons. On montre notamment que l’opérateur défini par cette fonction maximale est borné dans ${L}^{p}$, $1, quand les rayons forment une suite lacunaire itérée.

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Sjögren, Peter; Sjölin, Per. Littlewood-Paley decompositions and Fourier multipliers with singularities on certain sets. Annales de l'Institut Fourier, Volume 31 (1981) no. 1, pp. 157-175. doi : 10.5802/aif.821. https://aif.centre-mersenne.org/articles/10.5802/aif.821/

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