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Resumen de Variational problems with free boundaries for the fractional Laplacian

Luis A. Caffarelli Árbol académico, Jean-Michel Roquejoffre Árbol académico, Yannick Sire Árbol académico

  • We discuss properties (optimal regularity, non-degeneracy, smoothness of the free boundary...) of a variational interface problem involving the fractional Laplacian; Due to the non-locality of the Dirichlet problem, the task is nontrivial. This difficulty is by-passed by an extension formula, discovered by the first author and Silvestre, which reduces the study to that of a co-dimension 2 (degenerate) free boundary.

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