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Regularity of the free boundary for the two-phase Bernoulli problem

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arxiv 1911.02165 v2 pith:FR3VWLVM submitted 2019-11-06 math.AP

classification math.AP
keywords problemregularitybernoulliboundaryfreeminimizerstwo-phaseanalysis
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We prove a regularity theorem for the free boundary of minimizers of the two-phase Bernoulli problem, completing the analysis started by Alt, Caffarelli and Friedman in the 80s. As a consequence, we also show regularity of minimizers of the multiphase spectral optimization problem for the principal eigenvalue of the Dirichlet Laplacian.

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