Maximum Principle, Nonhomogeneous Harnack Inequality, and Liouville Theorems for X-Elliptic Operators

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Harnack Inequalities: An Introduction (2007, background): “Degenerate elliptic operators: [67] establishes a Harnack inequality, [68] investigates Green’s functions; [69, 70] allow for different new kinds of weights; [71] studies X-elliptic operators; [72] further relaxes assumptions on the weights and allows for terms of lower order; [73] investigates quit”