Abstract
In this article, we have established existence of a solution to the 2 -phase free boundary problem for some fully nonlinear elliptic equations and also shown the free boundary has finite Hn−1 Hausdorff measure and a normal in a measuretheoretic sense Hn−1 almost everywhere. The regularity theory developed in [9] and [10] for this free boundary problem then leads to the fact that the free boundary is locally a C1,α surface near Hn−1-a.e. point.
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Wang, PY. Existence of solutions of Two-Phase free boundary problems for fully nonlinear elliptic equations of second order. J Geom Anal 13, 715–738 (2003). https://doi.org/10.1007/BF02921886
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DOI: https://doi.org/10.1007/BF02921886