Publicacions Matemàtiques

The Riesz transform, rectifiability, and removability for Lipschitz harmonic functions

Abstract

We show that, given a set $E\subset{\mathbb R}^{n+1}$ with finite $n$-Hausdorff measure${\mathcal H}^n$, if the $n$-dimensional Riesz transform

$$R_{{\mathcal H}^n{\lfloor} E} f(x) = \int_{E} \frac{x-y}{|x-y|^{n+1}}\,f(y)\,{\mathcal H}^n(y)$$

is bounded in $L^2({\mathcal H}^n{\lfloor} E)$, then $E$ is $n$-rectifiable. From this result we deduce that a compact set $E\subset{\mathbb R}^{n+1}$ with ${\mathcal H}^n(E)<\infty$ is removable for Lipschitz harmonic functions if and only if it is purely $n$-unrectifiable, thus proving the analog of Vitushkin's conjecture in higher dimensions.

Article information

Source
Publ. Mat., Volume 58, Number 2 (2014), 517-532.

Dates
First available in Project Euclid: 21 July 2014

Permanent link to this document
https://projecteuclid.org/euclid.pm/1405949331

Mathematical Reviews number (MathSciNet)
MR3264510

Zentralblatt MATH identifier
1312.44005

Citation

Nazarov, Fedor; Tolsa, Xavier; Volberg, Alexander. The Riesz transform, rectifiability, and removability for Lipschitz harmonic functions. Publ. Mat. 58 (2014), no. 2, 517--532. https://projecteuclid.org/euclid.pm/1405949331