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when toggle format what by license comment
Oct 23, 2014 at 13:25 comment added Per Alexandersson Ah, ok, that makes more sense then.
Oct 23, 2014 at 13:18 comment added Daishisan The $n$ and $m$ were stated to just indicate that $A$ need not be rectangular --- they're numbers given to us.
Oct 23, 2014 at 7:55 history answered Per Alexandersson CC BY-SA 3.0