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Istvan PRAUSE

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BILIPSCHITZ ROTATION<br />

VERSUS<br />

QUASICONFORMAL STRETCHING<br />

István Prause<br />

joint work with<br />

Kari Astala, Tadeusz Iwaniec, Eero Saksman<br />

Tenerife, March 2012


Stretching vs Rotation<br />

stretching rotation<br />

quasiconformal bilipschitz<br />

Grötzsch problem John’s problem<br />

Hölder exponent rate of spiralling<br />

log J(z,f) BMO arg f BMO<br />

higher integrability exponential integrability<br />

multifractal ctal spectrum sp<br />

z


K-quasiconformal<br />

stretching bounds<br />

“complexify”<br />

Proofs<br />

rotation & stretching<br />

specialize<br />

quasiconformal category<br />

L-bilipschitz<br />

L-quasiconformal &<br />

no stretching


Thank you<br />

Courtesy of D. Marshall

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