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Du, Guangwei; Zhang, Kelei; Dong, Yan

Regularity of weak solutions to obstacle problems for nondiagonal quasilinear degenerate elliptic systems. (English) Zbl 1499.35285

J. Inequal. Appl. 2019, Paper No. 184, 16 p. (2019).
Summary: Let \(X=\{X_1 ,\dots ,X_m\}\) be a system of smooth real vector fields satisfying Hörmander’s rank condition. We consider the interior regularity of weak solutions to an obstacle problem associated with the nonhomogeneous nondiagonal quasilinear degenerate elliptic system \[X_{\alpha }^{\ast } \left( {A_{ij}^{\alpha \beta } (x,u)X_{\beta }u^j} \right)= B_i(x,u,Xu)+X_{\alpha }^{\ast }g_i^{\alpha }(x,u,Xu).\] After proving the higher integrability and a Campanato type estimate for the weak solutions to the obstacle problem for the homogeneous nondiagonal quasilinear degenerate elliptic system, the interior Morrey regularity and Hölder continuity of weak solutions to the obstacle problem for the nonhomogeneous system are obtained.

MSC:

35J62 Quasilinear elliptic equations
35J70 Degenerate elliptic equations

Keywords:

nondiagonal quasilinear degenerate elliptic system; obstacle problem; Morrey regularity; Hölder continuity
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