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Diffeomorphic approximation of Sobolev homeomorphisms
Approximation Sobolev homeomorphism dieomorphism p-harmonic
2010/11/26
Every homeomorphism h: X ! Y between planar open sets that belongs to the Sobolev class W 1;p(X;Y), 1 < p < 1, can be approximated in the Sobolev norm by C1-smooth dieomorphisms.