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Jan 12, 2012 at 19:06 history edited Igor Rivin CC BY-SA 3.0
fixed up argument.
Jan 12, 2012 at 17:33 comment added Igor Rivin Oops. Careless reading :(
Jan 12, 2012 at 17:11 comment added Vitali Kapovitch @Igor, the orbifold is only assumed to have finite volume but it need not be compact. so its fundamental group is not word hyperbolic.
Jan 12, 2012 at 16:41 history answered Igor Rivin CC BY-SA 3.0