Abstract
We prove a Harnack inequality for distributional solutions to a type of degenerate elliptic partial differential equations in N dimensions. The differential operators in question are related to the Kolmogorov operator, made up of the Laplacian in the last N−1 variables, a first-order term corresponding to a shear flow in the direction of the first variable, and a bounded measurable potential term. The first-order coefficient is a smooth function of the last N−1 variables and its derivatives up to certain order do not vanish simultaneously at any point, making the operators in question hypoelliptic.
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