## Abstract

Groups of the first kind. In [11], Patterson proved a hyperbolic space analogue of Khintchine's theorem on simultaneous Diophantine approximation. In order to state Patterson's theorem, some notation and terminology are needed. Let x denote the usual Euclidean norm of a vector x in k+1, k + 1-dimensional Euclidean space, and let ...

be the unit ball model of k + 1-dimensional hyperbolic space with Poincaré metric ¿. A non-elementary geometrically finite group G acting on Bk + 1 is a discrete subgroup of Möb (Bk+l), the group of orientation preserving Mobius transformations preserving Bk + 1, for which there exists some convex fundamental polyhedron with finitely many faces. Since G is non-elementary, the limit set L(G) of G – the set of limit points in the unit sphere Sk of any orbit of G in Bk+1 – is uncountable. The group G is said to be of the first kind if L(G) = Sk and of the second kind otherwise.

be the unit ball model of k + 1-dimensional hyperbolic space with Poincaré metric ¿. A non-elementary geometrically finite group G acting on Bk + 1 is a discrete subgroup of Möb (Bk+l), the group of orientation preserving Mobius transformations preserving Bk + 1, for which there exists some convex fundamental polyhedron with finitely many faces. Since G is non-elementary, the limit set L(G) of G – the set of limit points in the unit sphere Sk of any orbit of G in Bk+1 – is uncountable. The group G is said to be of the first kind if L(G) = Sk and of the second kind otherwise.

Original language | English |
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Pages (from-to) | 647-662 |

Number of pages | 16 |

Journal | Math Proc Cam Phil Soc |

Volume | 120 |

Issue number | 4 |

DOIs | |

Publication status | Published - 1996 |