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Regularity of viscosity solutions of the biased infinity Laplacian equation. (English) Zbl 1524.35251

Summary: In this paper, we are interested in the regularity estimates of the nonnegative viscosity super solution of the \(\beta\)-biased infinity Laplacian equation \[ \Delta^\beta_\infty u = 0, \] where \(\beta \in \mathbb{R}\) is a fixed constant and \(\Delta^\beta_\infty u := \Delta^N_\infty u + \beta |Du|\), which arises from the random game named biased tug-of-war. By studying directly the \(\beta\)-biased infinity Laplacian equation, we construct the appropriate exponential cones as barrier functions to establish a key estimate. Based on this estimate, we obtain the Harnack inequality, Hopf boundary point lemma, Lipschitz estimate and the Liouville property etc.

MSC:

35J62 Quasilinear elliptic equations
35J70 Degenerate elliptic equations
35B53 Liouville theorems and Phragmén-Lindelöf theorems in context of PDEs
Full Text: DOI

References:

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