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Aug 28, 2014 at 4:18 vote accept Dongyang Chen
Aug 28, 2014 at 4:10 comment added Bill Johnson Each answer has a checkmark, visible only to the OP, below it. Click the checkmark to accept the answer.
Aug 27, 2014 at 3:18 comment added Dongyang Chen @BillJohnson. I am sorry that I do not reply you as soon as possible because I am too busy to log in Mathoverflow when I come back to China. I do not know how to accept your answer to keep this thread from coming to the front. Could you tell me how to do?
Jul 18, 2014 at 15:45 answer added Bill Johnson timeline score: 1
Jul 18, 2014 at 14:14 history asked Dongyang Chen CC BY-SA 3.0