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Canadian Journal of Mathematics 63, 5 (2011) 1161-1187
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Transfer of Fourier multipliers into Schur multipliers and sumsets in a discrete group
Stefan Neuwirth 1, Éric Ricard 1
(10/2011)

We inspect the relationship between relative Fourier multipliers on noncommutative Lebesgue-Orlicz spaces of a discrete group and relative Toeplitz-Schur multipliers on Schatten-von-Neumann-Orlicz classes. Four applications are given: lacunary sets; unconditional Schauder bases for the subspace of a Lebesgue space determined by a given spectrum, that is, by a subset of the group; the norm of the Hilbert transform and the Riesz projection on Schatten-von-Neumann classes with exponent a power of 2; the norm of Toeplitz Schur multipliers on Schatten-von-Neumann classes with exponent less than 1.
1 :  Laboratoire de Mathématiques (LM-Besançon)
CNRS : UMR6623 – Université de Franche-Comté
Mathématiques/Analyse fonctionnelle

Mathématiques/Analyse classique
Fourier multiplier – Toeplitz Schur multiplier – lacunary set – unconditional approximation property – Hilbert transform – Riesz projection
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