Abstract
A surfaceM in a Riemannian manifold is said to have parallel normalized mean curvature vector if the mean curvature vector is nonzero and the unit vector in the direction of the mean curvature vector is parallel in the normal bundle. In this paper, it is proved that every analytic surface in a euclideanm-spaceEm with parallel normalized mean curvature vector must either lies in aE4 or lies in a hypersphere ofEm as a minimal surface. Moreover, it is proved that if a Riemann sphere inEm has parallel normalized mean curvature vector, then it lies either in aE3 or in a hypersphere ofEm as a minimal surfaces. Applications to the classification of surfaces with constant Gauss curvature and with parallel normalized mean curvature vector are also given.
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