The tusk condition and Petrovski criterion for the normalized \$p\mspace{1mu}\$-parabolic equation

19 Dec 2017  ·  Björn Anders, Björn Jana, Parviainen Mikko ·

We study boundary regularity for the normalized \$p\mspace{1mu}\$-parabolic equation in arbitrary bounded domains. Effros and Kazdan (Indiana Univ... Math. J. 20 (1970), 683-693) showed that the so-called tusk condition guarantees regularity for the heat equation. We generalize this result to the normalized \$p\mspace{1mu}\$-parabolic equation, and also obtain H\"older continuity. The tusk condition is a parabolic version of the exterior cone condition. We also obtain a sharp Petrovski criterion for the regularity of the latest moment of a domain. This criterion implies that the regularity of a boundary point is affected if one side of the equation is multiplied by a constant. read more

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