Niblo, G.A. (1995) Finding splittings of groups and three-manifolds. Bulletin of the London Mathematical Society, 27, 567-574.
Abstract
The class of almost finitely presented groups which admit a finite index subgroup which is an HNN extension is characterised using Scott's end invariant for a pair of groups. As in Scott's original paper on the subject the profinite topology plays a role.
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