On the strict concavity of the harmonic radius in dimension N >= 3

In this paper a result on the strict concavity of the harmonic radius in open convex domains of R-N, for N greater than or equal to 3, is given. It implies the strict convexity of the Robin function and the uniqueness of the harmonic center in bounded convex domains. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.