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Dec 19, 2012 at 3:06 comment added some guy on the street @André, you know, I mean it feels a bit like cheating...
Dec 19, 2012 at 3:05 comment added some guy on the street @Jim: what I mean is, this is the sort of picky question that I'm sure, if settled, was only done recently and I furthermore don't know who would write about it, nor what keywords to put into mathscinet/arxiv/google scholar search etc. Eight years ago or so my first move would have been to ask Dani Wise, just because he taught me about Gromov hyperbolic groups and the Rips complex, but he's not handy right now and I can't get to a library.
Dec 17, 2012 at 22:29 comment added André Henriques You do seem to know how to look for an answer: ask on mathoverflow!
Dec 17, 2012 at 14:36 comment added Jim Humphreys By the way, "I don't know how to look for the answer" suggests a serious obstruction to studying current mathematics. It's not helpful to re-invent the wheel too many times, so you need to develop skills in searching old and new liteature (arXiv included) along with identifying specific people who can provide shortcuts to answers. Traditionally graduate work is supposed to organize this whole complicated process.
Dec 17, 2012 at 12:03 comment added HJRW Here's a link to some recent work: people.maths.ox.ac.uk/bridson/papers/BReeves .
Dec 17, 2012 at 3:20 vote accept some guy on the street
Dec 17, 2012 at 1:16 answer added Andy Putman timeline score: 7
Dec 17, 2012 at 0:39 history asked some guy on the street CC BY-SA 3.0