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when toggle format what by license comment
Apr 6, 2020 at 18:27 vote accept Pablo Spiga
Jan 8, 2014 at 17:17 history edited so-called friend Don CC BY-SA 3.0
Changed $x$ to $N$ to agree with the notation of the original question
Jan 8, 2014 at 16:29 history answered so-called friend Don CC BY-SA 3.0