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Real-valued functions of real variable, analytic properties of functions and sequences, limits, continuity, smoothness of these.

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Proper Group action on a metric space

Let $(X,d)$ be a metric space and $C\subset X$ be a compact subset. Let furthermore $G$ be a group that acts on $X$ proper and by isometries. Does there exist an $\epsilon >0 $ such that: Let $U=$ {$x …
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