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Hölder continuity of weak solutions of \(p\)-Laplacian PDEs with VMO coefficients. (English) Zbl 1418.35058

Summary: We consider solutions \(u \in W^{1, p}(\Omega; \mathbb{R}^N)\) of the \(p\)-Laplacian PDE \[\nabla \cdot(a(x) | D u |^{p - 2} D u) = 0,\]for \(x \in \Omega \subseteq \mathbb{R}^n\), where \(\Omega\) is open and bounded. More generally, we consider solutions of the elliptic system \[\nabla \cdot (a(x) g^\prime(a(x) | D u |) \frac{D u}{| D u |}) = 0, x \in \Omega\]as well as minimizers of the functional \[\int_\Omega g(a(x) | D u |) d x .\]In each case, the coefficient map \(a : \Omega \rightarrow \mathbb{R}\) is only assumed to be of class \(V M O(\Omega) \cap L^\infty(\Omega)\), which means that it may be discontinuous. Without assuming that \(x \mapsto a(x)\) has any weak differentiability, we show that \(u \in \mathcal{C}_{\text{loc}}^{0, \alpha}(\Omega)\) for each \(0 < \alpha < 1\). The preceding results are, in fact, a corollary of a much more general result, which applies to the functional \[\int_\Omega f(x, u, D u) d x\] in case \(f\) is only asymptotically convex.

MSC:

35B65 Smoothness and regularity of solutions to PDEs
49N60 Regularity of solutions in optimal control
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
35J92 Quasilinear elliptic equations with \(p\)-Laplacian

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