The stekloff problem for rotationally invariant metrics on the ball

Let (Br,g) be a ball of radius r and gt;0 in Rn (n≥ 2) endowed with a rotationally invariant metricds2+f2(s)dw2, where dw2 represents the standard metric on Sn-1, the (n-1)--dimensional unit sphere. Assume that Br has non--negative sectional curvature. In this paper we prove that ifh(r) and gt;0 is...