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when toggle format what by license comment
Feb 4, 2012 at 23:40 comment added Charles Staats Sándor, do you mean $M = (u = 0)$?
Feb 4, 2012 at 15:48 vote accept gio
Feb 4, 2012 at 6:09 history answered Sándor Kovács CC BY-SA 3.0