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Results tagged with critical-point-theory
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user 4354
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Do the focal points of a submanifold $M$ in $\mathbb{R}^k$ form a closed subset?
Since the set of critical points is always closed, it suffices to assume that $\phi$ (or, more generally, its restriction to the set of its critical points) is proper. (A map is called {\it proper} if …
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