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Jun 7, 2013 at 23:11 comment added Mustafa Said Thank you. I was looking for the supremum and soon after I posted I realized it is obviously $\sqrt{2}$.
Jun 7, 2013 at 23:09 vote accept Mustafa Said
Jun 7, 2013 at 22:38 comment added Chris Wuthrich You meant $\sqrt{2}$ not $2$, no?
Jun 7, 2013 at 22:13 history answered Felipe Voloch CC BY-SA 3.0