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cc-by-nc-nd (c) Elsevier B.V., 2020
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/194137

Obstacle problems for integro-differential operators: Higher regularity of free boundaries

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We study the higher regularity of free boundaries in obstacle problems for integrodifferential operators. Our main result establishes that, once free boundaries are $C^{1, \alpha}$, then they are $C^{\infty}$. This completes the study of regular points, initiated in [5]. In order to achieve this, we need to establish optimal boundary regularity estimates for solutions to linear nonlocal equations in $C^{k, \alpha}$ domains. These new estimates are the core of our paper, and extend previously known results by Grubb (for $k=\infty$ ) and by the second author and Serra (for $k=1$ ).

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ABATANGELO, Nicola and ROS, Xavier. Obstacle problems for integro-differential operators: Higher regularity of free boundaries. Advances in Mathematics. 2020. Vol. 360, num. Article 106931, pags. 106931. ISSN 0001-8708. [consulted: 30 of May of 2026]. Available at: https://hdl.handle.net/2445/194137

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