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Katrin FAESSLER

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Radial stretch maps<br />

On the complex plane<br />

fk(z) = |z| k−1 z, (0 < k < 1).<br />

a prototype for quasiconformal mappings<br />

extremal for various problems.<br />

Question<br />

Radial stretch map on the sub-Riemannian Heisenberg group?<br />

<strong>Katrin</strong> Fässler (University of Helsinki) A stretch map on H 1<br />

HCAA 2012 2 / 23

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