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Free Fourier Multipliers associated with the firstSegment

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arxiv 1909.06879 v1 pith:PVPR7DWR submitted 2019-09-15 math.OA math.FA

classification math.OAmath.FA
keywords mathbbfourierfreeinftyassociatedboundedcompletelymultiplier
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abstract

We study Fourier multipliers on free group $\mathbb{F}_\infty$ associated with the first segment of the reduced words, and prove that they are completely bounded on the noncommutative $L^p$ spaces $L^p(\hat{\mathbb{F}}_\infty)$ iff their restriction on $L^p(\hat{\mathbb{F}}_1)=L^p(\mathbb{T})$ are completely bounded. As a consequence, every classical Mikhlin multiplier extends to a $L^p$ Fourier multiplier on free groups for all $1<p<\infty$.

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    cs.CR 2019-08 conditional novelty 6.0 of 10

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