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Apr 26, 2011 at 16:11 comment added Alain Valette Well, I suppose I'm appealing to van Dantzig's theorem...
Apr 26, 2011 at 14:54 comment added Hugo Chapdelaine So how do you show the existence of such a basis of neighborhoods at $e$ in $H$. Definitely you need $H$ to be closed but I don't see how to use it.
Apr 26, 2011 at 13:23 history answered Alain Valette CC BY-SA 3.0