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Oct 6, 2011 at 17:00 comment added Lin Jianfeng Thanks very much!!! I think 3 is a very elaborate estimate. I have no idea can this estimate be improved. I will think about it more carefully. Thank you very much! Your answer is very inspiring for me.
Oct 6, 2011 at 16:53 vote accept Lin Jianfeng
Oct 6, 2011 at 15:35 history undeleted Ian Agol
Oct 6, 2011 at 15:34 history edited Ian Agol CC BY-SA 3.0
deleted 598 characters in body; added 214 characters in body
Oct 6, 2011 at 5:30 history deleted Ian Agol
Oct 6, 2011 at 5:17 history answered Ian Agol CC BY-SA 3.0