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On planar Sobolev L-p(m)-extension domains
Shvartsman, Pavel Zobin, Nahum
Shvartsman, Pavel
Zobin, Nahum
Abstract
For each m > = 1 and p > 2 we characterize bounded simply connected Sobolev L-p(m)-extension domains Omega subset of R-2. Our criterion is expressed in terms of certain intrinsic subhyperbolic metrics in Omega. Its proof is based on a series of results related to the existence of special chains of squares joining given points x and y in Omega. An important geometrical ingredient for obtaining these results is a new "Square Separation Theorem". It states that under certain natural assumptions on the relative positions of a point x and a square S subset of Omega there exists a similar square Q subset of Omega which touches S and has the property that x and S belong to distinct connected components of Omega \ Q. (C) 2015 Elsevier Inc. All rights reserved.
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2016-01-01
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on_planar.pdf
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Mathematics
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10.1016/j.aim.2015.08.031