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Mar 24, 2011 at 18:56 comment added Lor ok thank you, and sorry..it's my first question on MathOverflow
Mar 24, 2011 at 18:55 vote accept Lor
Mar 22, 2011 at 7:46 comment added Lor Wow thank you so much..you give me lots of things to think about! thank you again for your answer!
Mar 17, 2011 at 12:19 history answered Greg Kuperberg CC BY-SA 2.5