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Necessary conditions for vector-valued operator inequalities in harmonic analysis

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arxiv math/0504030 v1 pith:HFOSBTFX submitted 2005-04-01 math.CA

Necessary conditions for vector-valued operator inequalities in harmonic analysis

classification math.CA
keywords functionsanalysisconditionsharmonicinequalitiesnecessaryactingarising
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Via a random construction we establish necessary conditions for $L^p(\ell^q)$ inequalities for certain families of operators arising in harmonic analysis. In particular we consider dilates of a convolution kernel with compactly supported Fourier transform, vector maximal functions acting on classes of entire functions of exponential type, and a characterization of Sobolev spaces by square functions and pointwise moduli of smoothness.

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