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when toggle format what by license comment
Sep 1, 2015 at 17:59 history edited Ilya Bogdanov CC BY-SA 3.0
The last formula corrected in non-mathematical part.
Mar 1, 2010 at 6:25 vote accept Ewan Delanoy
Feb 28, 2010 at 16:25 history answered Gjergji Zaimi CC BY-SA 2.5