A growth lemma for certain discrete symmetric Laplacians defined on a lattice Z d δ = δZ d ⊂ R d with spacing δ is proved. The lemma implies a De Giorgi theorem, that the harmonic functions for these Laplacians are equi-Hölder continuous, δ → 0. These results are then applied to establish regularity
Regularity of harmonic functions for anisotropic fractional Laplacians
✍ Scribed by Paweł Sztonyk
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 230 KB
- Volume
- 283
- Category
- Article
- ISSN
- 0025-584X
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✦ Synopsis
Abstract
We prove that bounded harmonic functions of anisotropic fractional Laplacians are Hölder continuous under mild regularity assumptions on the corresponding Lévy measure. Under some stronger assumptions the Green function, Poisson kernel and the harmonic functions are even differentiable of order up to three (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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