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Jul 14, 2010 at 21:30 history edited Ian Agol CC BY-SA 2.5
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Jul 14, 2010 at 21:30 comment added user7621 Thanks! You and Lennart gave the same nice proofs. Though he gave his 3 minutes after you, the references he gave make his easier to follow. I thus choose to accept his answer. Again, thanks!
Jul 14, 2010 at 21:20 history answered Dmitri Panov CC BY-SA 2.5