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Jan 13, 2016 at 11:02 vote accept Norbert
Jan 13, 2016 at 22:32
Jan 13, 2016 at 11:02 comment added Norbert I was always sure that this trick works only for some $x\notin Y$, not for all of them. Thank you.
Jan 13, 2016 at 8:43 history edited Fedor Petrov CC BY-SA 3.0
added 2 characters in body
Jan 13, 2016 at 5:25 history answered Mikhail Ostrovskii CC BY-SA 3.0