We establish the higher fractional differentiability of the solutions to nonlinear elliptic equations in divergence form, i.e., divA(x, Du) = div F, when A is a p-harmonic type operator, and under the assumption that x → A(x, ζ) belongs to the critical Besov-Lipschitz space B an/a,q∗ We prove that some fractional differentiability assumptions on F transfer to Du with no losses in the natural exponent of integrability. When div F = 0, we show that an analogous extra differentiability property for Du holds true under a Triebel- Lizorkin assumption on the partial map x → A(x, ζ).
CITATION STYLE
Clop, A., Giova, R., & Passarelli Di Napoli, A. (2019). Besov regularity for solutions of p-harmonic equations. Advances in Nonlinear Analysis, 8(1), 762–778. https://doi.org/10.1515/anona-2017-0030
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