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Mar 31, 2012 at 4:30 comment added Igor Rivin @Misha: Thanks! I did notice that this was the same argument -- I guess Whitehead found the canonical argument...
Mar 31, 2012 at 3:10 comment added Misha @Igor: That's a nice reference! Actually, Whitehead's proof is essentially the same as the one outlined by Lee.
Mar 31, 2012 at 0:34 history answered Igor Rivin CC BY-SA 3.0