no. 2
Invertibility of Sobolev mappings under minimal hypotheses
Annales de l'I.H.P. Analyse non linéaire, Tome 27 (2010) no. 2, pp. 517-528

We prove a version of the Inverse Function Theorem for continuous weakly differentiable mappings. Namely, a nonconstant W 1,n mapping is a local homeomorphism if it has integrable inner distortion function and satisfies a certain differential inclusion. The integrability assumption is shown to be optimal.

DOI : 10.1016/j.anihpc.2009.09.010
Classification : 30C65, 26B10, 26B25
Keywords: Local homeomorphism, Differential inclusion, Finite distortion 
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Kovalev, Leonid V.; Onninen, Jani; Rajala, Kai. Invertibility of Sobolev mappings under minimal hypotheses. Annales de l'I.H.P. Analyse non linéaire, Tome 27 (2010) no. 2, pp. 517-528. doi: 10.1016/j.anihpc.2009.09.010

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