Di Fazio, Giuseppe and Zamboni, Pietro:
Local regularity of solutions to quasilinear subelliptic equations in Carnot Caratheodory spaces
Bollettino dell'Unione Matematica Italiana Serie 8 9-B (2006), fasc. n.2, p. 485-504, (English)
pdf (447 Kb), djvu (170 Kb). | MR 2233147 | Zbl 1178.35163
Sunto
In questa nota proviamo la disuguaglianza di Harnack per le soluzioni deboli di una equazione sub-ellittica quasilineare del tipo \begin{equation*}\tag{*}\sum_{J=1}^{m} X_{j}^{*}A_{j}(x, u(x), Xu(x)) + B(x, u(x), Xu(x)) = 0,\end{equation*} dove $X_{1}, \ldots, X_{m}$ denotano un sistema non commutativo di campi vettoriali localmente lipschitziani. Come conseguenza otteniamo la continuità delle soluzioni deboli della (*).
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