On directional maximal operators associated with generalized lacunary sets

Details On directional maximal operators associated with generalized lacunary sets On directional maximal operators associated with generalized lacunary sets

2005-11-19

arxiv.org/abs/math/0511480v1

Mathematics

Classical Analysis and ODEs

Scientific paper

Let $\Omega $ be any set of directions (unit vectors) on the plane. We study maximal operators defined by \md0 M_\Omega f(x)=\sup_{\delta >0, \omega \in \Omega} \frac{1}{2\delta}\int_{-\delta}^\delta |f(x+t\omega)|dt. \emd for the generalized lacunary sets $\Omega $ associated with an integer $\mu >0$. It is proved the following sharp inequality: $$ \|M_\Omega f(x)\|_2\lesssim \sqrt{\mu} \|f\|_2. $$

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