Geodesic
Harnack Inequality and Smoothness for some Non Linear Degenerate Elliptic Equations
Minimax theory and its applications, Tome 4 (2019) no. 1

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We prove Harnack inequality and smoothness for weak solutions of quasilinear degenerate elliptic equation with respect to a system of non commuting vector fields. In addition, the structure assumptions allow quadratic growth in the gradient.
Mots-clés : Harnack inequality, Muckenhoupt weights, degenerate elliptic equations, Stummel Kato classes, Hörmander vector fields 
Giuseppe Di Fazio,Maria S. Fanciullo,Pietro Zamboni. Harnack Inequality and Smoothness for some Non Linear Degenerate Elliptic Equations. Minimax theory and its applications, Tome 4 (2019) no. 1. http://geodesic.mathdoc.fr/item/MTA_2019_4_1_a5/
@article{MTA_2019_4_1_a5,
     author = {Giuseppe Di Fazio,Maria S. Fanciullo,Pietro Zamboni},
     title = {Harnack {Inequality} and {Smoothness} for some {Non} {Linear} {Degenerate} {Elliptic} {Equations}},
     journal = {Minimax theory and its applications},
     year = {2019},
     volume = {4},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MTA_2019_4_1_a5/}
}
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