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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Oct 31, 2016 at 13:56 history edited LSpice CC BY-SA 3.0
Added link to Dehornoy article
Feb 19, 2010 at 1:45 comment added John Stillwell Slides of a recent talk by Dehornoy on the history of this braid group problem may be found at math.unicaen.fr/~dehornoy/Talks/DyfShort.pdf
Feb 17, 2010 at 0:06 history answered algori CC BY-SA 2.5