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A convexity theorem for proper Dupin hypersurfaces in spheres
We prove that if $M$ is a (compact, connected, and embedded) proper Dupin hypersurface in a sphere then, viewing $M$ as a submanifold of the ambient Euclidean space, its orthogonal projection to the normal space at any point is convex. This is a generalization of the convexity theorem of Terng for i
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