Mappings of finite distortion: The zero set of the Jacobian

Pekka Koskela1, Jan Malý2
1University of Jyväskylä, Department of Mathematics and Statistics, P.O. Box 35, FIN-40351 Jyväskylä, Finland; e-mail: [email protected], , FI
2Charles University, Department KMA of the Faculty of Mathematics and Physics, Sokolovská 83, CZ-18675 Praha 8, Czech Republic. e-mail: [email protected], , CZ