We prove a version of the Inverse Function Theorem for continuous weakly differentiable mappings. Namely, a nonconstant 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.
@article{AIHPC_2010__27_2_517_0, author = {Kovalev, Leonid V. and Onninen, Jani and Rajala, Kai}, title = {Invertibility of Sobolev mappings under minimal hypotheses}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {27}, year = {2010}, pages = {517-528}, doi = {10.1016/j.anihpc.2009.09.010}, mrnumber = {2595190}, zbl = {1190.30019}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_2010__27_2_517_0} }
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) pp. 517-528. doi : 10.1016/j.anihpc.2009.09.010. http://gdmltest.u-ga.fr/item/AIHPC_2010__27_2_517_0/
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