On Harnack's inequality for a class of strongly degenerate Schrödinger operators formed by vector fields
The main goal of this paper is to prove a Harnack inequality for the nonnegative solutions of certain Schrödinger equations. The author proves mean value and Harnack inequalities for exponential balls. The Harnack inequality for any other metric balls is immediate by the equivalence of all these balls.
strongly degenerate Schrödinger operators
scientific article; zbMATH DE number 503551