Proposition 9.1.10.label Let $G$ be a topological group, then
- (1)
$G$ admits a fundamental system of neighbourhoods at $0$ consisting of symmetric sets.
- (2)
The system in (1) may be taken to be open or closed.
Proposition 9.1.10.label Let $G$ be a topological group, then
$G$ admits a fundamental system of neighbourhoods at $0$ consisting of symmetric sets.
The system in (1) may be taken to be open or closed.
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