Mathematics – Analysis of PDEs
Scientific paper
2011-10-11
J. Nonlinear Convex Anal. 7 (2006), No. 3, 499-514
Mathematics
Analysis of PDEs
This is the definitive version of a lecture delivered at the International Conference on "Recent Advances in PDEs" in memory o
Scientific paper
A degenerate oblique derivative problem is studied for uniformly elliptic operators with low regular coefficients in the framework of Sobolev's classes $W^{2,p}(\Omega)$ for {\em arbitrary} $p>1.$ The boundary operator is prescribed in terms of a directional derivative with respect to the vector field $\l$ that becomes tangential to $\partial \Omega$ at the points of some non-empty subset $\E\subset \partial \Omega$ and is directed outwards $\Omega$ on $\partial\Omega\setminus\E.$ Under quite general assumptions of the behaviour of $\l,$ we derive {\it a priori} estimates for the $W^{2,p}(\Omega)$-strong solutions for any $p\in(1,\infty).$
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