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May 2, 2012 at 14:50 comment added Ian Agol @Benjamin: I think just wedge this example with another loop.
May 2, 2012 at 13:06 vote accept Benjamin Steinberg
May 2, 2012 at 13:04 comment added Benjamin Steinberg I should have though to try a finite index subgroup since the Stallings graph is the whole covering space. Do you know examples where both subgroups have infinite index?
May 2, 2012 at 13:02 vote accept Benjamin Steinberg
May 2, 2012 at 13:06
May 2, 2012 at 3:52 history answered Ian Agol CC BY-SA 3.0