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Oct 4, 2012 at 13:22 comment added Anthony Quas The set of sequences such that <i>for all</i> $n$, <i>there exists</i> $m$ such that $A\cap [m,m+n]=\emptyset$. This is a countable intersection of open sets.
Apr 19, 2012 at 17:48 comment added Valerio Capraro I am sorry, but I do not understand your second paragraph. Could you add some details? Thank you.
Apr 18, 2012 at 17:24 comment added François G. Dorais How do you know that the set is $G_\delta$?
Apr 18, 2012 at 17:18 history answered Nir CC BY-SA 3.0