Let $G$ be a group that acts on a manifold $X$. It is well know that the orbir space $X/G$ isn't in general a manifold. But how can I prove that there is always a dense open $U \subset X$ that is $G$-invariant?
2026-03-27 04:56:54.1774587414
Existence of dense subsets $G$-invariant.
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