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Gradient regularity for $(s,p)$-harmonic functions

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arxiv 2409.02012 v1 pith:OWYXMF4D submitted 2024-09-03 math.AP

classification math.AP
keywords functionsharmonicgradientlocalregularityweakfractionalolder
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abstract

We study the local regularity properties of $(s,p)$-harmonic functions, i.e. local weak solutions to the fractional $p$-Laplace equation of order $s\in (0,1)$ in the case $p\in (1,2]$. It is shown that $(s,p)$-harmonic functions are weakly differentiable and that the weak gradient is locally integrable to any power $q\geq 1$. As a result, $(s,p)$-harmonic functions are H\"older continuous to arbitrary H\"older exponent in $(0,1)$. In addition, the weak gradient of $(s,p)$-harmonic functions has certain fractional differentiability. All estimates are stable when $s$ reaches $1$, and the known regularity properties of $p$-harmonic functions are formally recovered, in particular the local $W^{2,2}$-estimate.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Improved H\"older regularity of fractional $(p,q)$-Poisson equation with regular data

    math.AP 2025-07 conditional novelty 7.0 of 10

    For the fractional (p,q)-Poisson equation, viscosity solutions are C^{0,γ} with explicit exponent min{1, (sp+α∧β)/(p-1), sp/(p-2)} for p>2, and Lipschitz when that exponent exceeds 1.

  2. Sobolev regularity for the nonlocal $(1, p)$-Laplace equations in the superquadratic case

    math.AP 2025-05 conditional novelty 6.0 of 10

    Weak solutions of the nonlocal (1,p)-Laplace equation in the superquadratic case p≥2 are shown to lie in W^{γ,q}_{loc} for γ< spp/(p−1), and to have a gradient in L^q_{loc} when sp>(p−1)/p.

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