Hausdorff-content comparability under principal quasiconformal mappings

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Let d∈(0,2]d\in(0,2], let E⊂CE\subset\mathbb C be compact, and let hh be a principal KK-quasiconformal mapping conformal on C∖E\mathbb C\setminus E. Here Md\mathcal M^d denotes dd-dimensional Hausdorff content, and A≃BA\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.

References

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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