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when toggle format what by license comment
Jan 4, 2010 at 11:06 comment added Ilya Nikokoshev Yes indeed, I forgot ch must be algebraic :)
Jan 4, 2010 at 11:05 vote accept Ilya Nikokoshev
Jan 4, 2010 at 4:00 history answered Tony Pantev CC BY-SA 2.5