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Oct 25, 2016 at 10:47 comment added Friedrich Knop What about $G=\mathbb C^*$ acting on $\mathbb C^n$, $n\ge2$ by scalars and $U=\mathbb C^n\setminus\{0\}$?
Oct 25, 2016 at 10:13 history asked SHP CC BY-SA 3.0