Variational inequalities with lack of ellipticity. Part I: Optimal interior regularity and non-degeneracy of the free boundary
Donatella DanielliNicola GarofaloSandro Salsa
35J8535H2043A85Obstacle problemFree boundariesSub-elliptic equationsCarnot groupsTheorems of Rademacher-Stepanov type
Indiana University Mathematics Journal
2003
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10.1512/iumj.2003.52.2088
10.1512/iumj.2003.52.2088
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Indiana Univ. Math. J. 52 (2003) 361 - 398
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