Beltrami equations with coefficient in the Sobolev space $W^{1,p}$

Details Beltrami equations with coefficient in the Sobolev space $W^{1,p}$ Beltrami equations with coefficient in the Sobolev space $W^{1,p}$

2007-03-22

arxiv.org/abs/math/0703680v1

Mathematics

Analysis of PDEs

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Scientific paper

We study the removable singularities for solutions to the Beltrami equation $\bar\partial f=\mu \partial f$, assuming that the coefficient $\mu$ lies on some Sobolev space $W^{1,p}$, $p\leq 2$. Our results are based on an extended version of the well known Weyl's lemma, asserting that distributional solutions are actually true solutions. Our main result is that quasiconformal mappings with compactly supported Beltrami coefficient $\mu\in W^{1,2}$ preserve compact sets of $\sigma$-finite length and vanishing analytic capacity, even though they need not be bilipschitz.

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