Definition 9.1.9 (Symmetric Neighbourhood).label Let $G$ be a topological group and $U \in \cn_{G}(1)$, then $U$ is symmetric if $U = U^{-1}$.
Definition 9.1.9 (Symmetric Neighbourhood).label Let $G$ be a topological group and $U \in \cn_{G}(1)$, then $U$ is symmetric if $U = U^{-1}$.
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