SURFACES OF REVOLUTION SATISFYING IIG = f(G + C)
Abstract. In this paper, we study surfaces of revolution without par-
abolic points in 3-Euclidean space R3, satisfying the condition IIG =
f(G+ C), where II is the Laplace operator with respect to the second
fundamental form, f is a smooth function on the surface and C is a con-
stant vector. Our main results state that surfaces of revolution without
parabolic points in R3 which satisfy the condition IIG = fG, coincide
with surfaces of revolution with non-zero constant Gaussian curvature.