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May 26, 2014 at 23:03 comment added 喻 良 I would like to add a remark that it can be shown that the base is not second order arithmetic definable.
May 7, 2011 at 5:23 vote accept Andrés E. Caicedo
Apr 13, 2011 at 14:48 comment added Bjørn Kjos-Hanssen Nice, much better than my example.
Apr 13, 2011 at 9:07 history answered 喻 良 CC BY-SA 3.0