Intrinsic Lipschitz graphs in Heisenberg groups and continuous solutions of a balance equation
arXiv:1202.3083 · doi:10.1016/j.anihpc.2014.05.001
Abstract
In this paper we provide a characterization of intrinsic Lipschitz graphs in the sub-Riemannian Heisenberg groups in terms of their distributional gradients. Moreover, we prove the equivalence of different notions of continuous weak solutions to the equation ϕ_y+ [ϕ^{2}/2]_t=w, where w is a bounded function depending on ϕ.