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May 21, 2012 at 1:19 vote accept Ben
May 21, 2012 at 1:19 comment added Ben Oh sorry,I have made a mistake in the question.$(x)$ should be equal to $|x-[x]|$,where $[x]$ is the nearest integer to $x$.
May 19, 2012 at 15:39 answer added Douglas Zare timeline score: 4
May 19, 2012 at 13:54 answer added Igor Rivin timeline score: 1
May 19, 2012 at 13:49 answer added Charles Matthews timeline score: 2
May 19, 2012 at 13:28 history asked Ben CC BY-SA 3.0