Quasiconformal mappings and singularity of boundary distortion

Details Quasiconformal mappings and singularity of boundary distortion Quasiconformal mappings and singularity of boundary distortion

2008-02-17

arxiv.org/abs/0802.2356v1

Mathematics

Complex Variables

13 pages, 1 figure

Scientific paper

We extend a well-known theorem by Jones and Makarov [JM] on the singularity of boundary distortion of planar conformal mappings. We use a different technique to recover the previous result and, moreover, generalize the result for quasiconformal mappings of the unit ball $\B^n\subset \mathbb{R}^n$, $n\ge 2$. We also establish an estimate on the Hausdorff (gauge) dimension of the boundary of the image domain outside an exceptional set of given size on the sphere $\partial \B^n$. Furthermore, we show that this estimate is essentially sharp. [JM] P. W. Jones and N. Makarov: Density properties of harmonic measure. Ann. Math. 142 (1995), 427--455.

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