Maximum principle on unbounded domains for sub-Laplacians: A potential theory approach
Andrea Bonfiglioli, Ermanno Lanconelli · Proceedings of the American Mathematical Society · 2002
The maximum principle on a wide class of unbounded domains is proved for solutions to the partial differential inequality $\Delta _{\mathbb {G}}u+c u\geq 0$, where $c\leq 0$ and $\Delta _{\mathbb {G}}$ is a real sub-Laplacian. A potential theory approach is followed.