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Apr 13, 2013 at 12:53 comment added Mike Jury Yes, that's much cleaner. And I would also suspect it is not $G_{\delta\sigma}$.
Apr 10, 2013 at 21:13 history edited Etienne CC BY-SA 3.0
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Apr 10, 2013 at 19:19 history answered Etienne CC BY-SA 3.0