Hausdorff-content comparability under principal quasiconformal mappings

From papers

Let d(0,2]d\in(0,2], let ECE\subset\mathbb C be compact, and let hh be a principal KK-quasiconformal mapping conformal on CE\mathbb C\setminus E. Here Md\mathcal M^d denotes dd-dimensional Hausdorff content, and ABA\simeq B means comparability up to multiplicative constants. Hausdorff-content comparability conjecture. One has

Md(h(E))Md(E),\mathcal M^d(h(E))\simeq\mathcal M^d(E),

with constants depending only on KK and dd. Such a counterpart to the known one-dimensional estimate is presented as crucial for understanding distortion of Hausdorff measures under quasiconformal mappings, and remains open in the supplied text.

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Primary source

Kari Astala, Albert Clop, Joan Mateu, Joan Orobitg and Ignacio Uriarte-Tuero, “Distortion of Hausdorff measures and improved Painlevé removability for quasiregular mappings”, arXiv:math/0609327 (2006).

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