Local regularity of solutions to quasilinear subelliptic equations in Carnot Caratheodory spaces
Bollettino della Unione matematica italiana, Série 8, 9B (2006) no. 2, pp. 485-504.

Voir la notice de l'article dans Biblioteca Digitale Italiana di Matematica

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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Di Fazio, Giuseppe; Zamboni, Pietro. Local regularity of solutions to quasilinear subelliptic equations in Carnot Caratheodory spaces. Bollettino della Unione matematica italiana, Série 8, 9B (2006) no. 2, pp. 485-504. https://geodesic-test.mathdoc.fr/item/BUMI_2006_8_9B_2_a11/

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