Abstract
In this paper we consider the following two-phase obstacle-problem-like equation in the unit half-ball
We prove that the free boundary touches the fixed boundary (uniformly) tangentially if the boundary data f and its first and second derivatives vanish at the touch-point.
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Andersson, J., Matevosyan, N. & Mikayelyan, H. On the tangential touch between the free and the fixed boundaries for the two-phase obstacle-like problem. Ark Mat 44, 1–15 (2006). https://doi.org/10.1007/s11512-005-0005-2
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DOI: https://doi.org/10.1007/s11512-005-0005-2