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A new characterization of the sphere in R 3

Thomas Hasanis — 1980

Annales Polonici Mathematici

Let M be a closed connected surface in R 3 with positive Gaussian curvature K and let K I I be the curvature of its second fundamental form. It is shown that M is a sphere if K I I = c H K r , for some constants c and r, where H is the mean curvature of M.

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