A Global Lower Bound for the Fundamental Solution of Kolmogorov-Fokker-Planck Equations
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where the ai, j's and their first derivatives are Hölder continuous functions and 0 < p0 < N. The bound will follow from a local estimate of Γ and a Harnack inequality for non-negative solutions of Lu = 0, by exploiting the invariance of the Harnack inequality with respect to suitable translation and dilation groups. For non-degenerate parabolic operators, our methods and results generalize those of Aronson & Serrin .
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