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Masiello, Alba Lia; Paoli, Gloria
The Journal of geometric analysis, 05/2023, Letnik: 33, Številka: 5Journal Article
Let Ω ⊂ R 2 be an open, bounded and Lipschitz set. We consider the torsion problem for the Laplace operator associated to Ω with Robin boundary conditions. In this setting, we study the equality case in the Talenti-type comparison, proved in Alvino et al. (Commun Pure Appl Math 76:585–603, 2023).. We prove that the equality is achieved only if Ω is a disk and the torsion function u is radial.
