Maximum Principles and Singular Elliptic Inequalities

In this paper, we present a version of the Omori–Yau maximum principle, a Liouville-type result, and a Phragmen–Lindelöff-type theorem for a class of singular elliptic operators on a Riemannian manifold, which include the p-Laplacian and the mean curvature operator. Some applications of the results obtained are discussed.