El problema de Steklov sobre el cono

let (mn, g) be a cone of height 0 ≤ xn+1 ≤ 1 en ？n+1, endowed with a rotationally invariant metric 2ds2 + ？2(s)dw2, where dw2 represents the standard metric on sn-1, the (n - 1)-dimensional unit sphere. assume ric(g) ≥ 0. in this paper we prove that if h > 0 is the mean curvature on ？m and v1 is the first eigenvalue of the steklov problem, then v1 ≥ h.