Bounds for Kakeya-type maximal operators associated with k-planes

Details Bounds for Kakeya-type maximal operators associated with k-planes Bounds for Kakeya-type maximal operators associated with k-planes

2005-12-15

arxiv.org/abs/math/0512377v1

Mathematics

Classical Analysis and ODEs

9 pages. No figures

Scientific paper

A (d,k) set is a subset of R^d containing a translate of every k-dimensional plane. Bourgain showed that for k \geq k_{cr}(d), where k_{cr}(d) solves 2^{k_{cr}-1}+k_{cr} = d, every (d,k) set has positive Lebesgue measure. We give a short proof of this result which allows for an improved L^p estimate of the corresponding maximal operator, and which demonstrates that a lower value of k_{cr} could be obtained if improved mixed-norm estimates for the x-ray transform were known.

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