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Oct 31, 2014 at 12:40 vote accept Haimiao Chen
Oct 31, 2014 at 12:45
Oct 31, 2014 at 7:28 comment added Haimiao Chen Thank you! It is a good news to me that it is hopeful to compute $\pi_{3}$ of many closed 3-manifolds.
Oct 30, 2014 at 22:11 comment added Fernando Muro Beautiful answer!
Oct 30, 2014 at 21:08 history answered Allen Hatcher CC BY-SA 3.0