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DIOPHANTINE APPROXIMATION AND THE GEOMETRY OF LIMIT SETS IN GROMOV HYPERBOLIC METRIC SPACES
"... Abstract. In this paper, we provide a complete theory of Diophantine approximation in the limit set of a group acting on a Gromov hyperbolic metric space. This summarizes and completes what has until now been an ad hoc collection of results by many authors. In addition to providing much greater gene ..."
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Abstract. In this paper, we provide a complete theory of Diophantine approximation in the limit set of a group acting on a Gromov hyperbolic metric space. This summarizes and completes what has until now been an ad hoc collection of results by many authors. In addition to providing much greater generality than any prior work, our results also give new insight into the nature of the connection between Diophantine approximation and the geometry of the limit set within which it takes place. Two results are also contained here which are purely geometric: a generalization of a theorem of C. J. Bishop and P. W. Jones to Gromov hyperbolic metric spaces, and a proof that the uniformly radial limit set of a group acting on a proper geodesic Gromov hyperbolic metric space has zero PattersonSullivan measure unless the group is quasiconvexcocompact. The latter is an application of a Diophantine theorem. Contents