Abstract
We derive local boundedness estimates for weak solutions of a large class of second-order quasilinear equations. The structural assumptions imposed on an equation in the class allow vanishing of the quadratic form associated with its principal part and require no smoothness of its coefficients. The class includes second-order linear elliptic equations as studied in [5] and second-order subelliptic linear equations as in [8, 9]. Our results also extend ones obtained by J. Serrin [7] concerning local boundedness of weak solutions of quasilinear elliptic equations.
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