The Singular Set of Higher Dimensional Unstable Obstacle Type Problems
classification
🧮 math.AP
keywords
equationquadsingularunstableboundarycharacteristicdeltadimensional
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In this paper we will investigate the singular points of the following unstable free boundary problem: {equation}\label{Eq} \Delta u= -\chi_{\{u>0\}} \quad\quad\textrm{in} B_1(0) {equation} where $\chi_{\{u>0\}}$ is the characteristic function of the set $\{u>0\}$.
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