A note on the Serrin problem in the plane

Abstract

We investigate the stability of the radial symmetry for the overdetermined Serrin problem in a planar convex set. More precisely, we prove that, whenever we properly perturb both the boundary conditions and the data, then a convex solution is “close” to a suitable paraboloid and the domain is “close” to a ball with respect to the Hausdorff metric.

Keywords

• Overdetermined problems
• convexity
• isoperimetric inequality