Quasi-isometries between groups with two-ended splittings
We construct a ‘structure invariant’ of a one-ended, finitely presented group that describes
the way in which the factors of its JSJ decomposition over two-ended subgroups fit together.
For hyperbolic groups satisfying a very general condition, these invariants completely reduce the problem of classifying such groups up to quasi-isometry to a relative quasi-isometry
classification of the factors of their JSJ decomposition. Under some additional assumption,
our results extend to more general finitely presented groups, yielding a far-reaching generalisation of the quasi-isometry classification of some 3–manifolds obtained by Behrstock and
The same approach also allows us to obtain such a reduction for the problem of determining when two hyperbolic groups have homeomorphic Gromov boundaries.
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