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arXiv math/9403222math.DS
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豪斯多夫维数与克莱因群

Hausdorff dimension and Kleinian groups

Christopher J. Bishop, Peter Jones

摘要:

设G是一个非初等的、非线性生成的Kleinian群,Lambda(G)是它的极限集,Omega(G)= S \ Lambda(G)(S =球面)是它的不连续集.设delta(G)是Poincaré级数的临界指数,Lambda_c是G的锥极限集.设Omega_0是Omega(G)的一个单连通分支.我们证明了(1)delta(G)= dim(Lambda_c)。(2)一个单连通分支Omega是一个圆盘或dim(Omega)>1$。(3)λ(G)是全不连通的、圆或维数> 1,(4)G是几何无限的当且仅当dim(λ)=2. (5)若G_n代数地\to G则dim(Lambda)<= \liminf dim(Lambda_n). (6)Lambda的Minkowski维度等于豪斯多夫维数。(7)如果面积(λ)=0,则delta(G)= dim(λ(G))。证明了\dim(Lambda(G))> 1当且仅当锥极限集的维数> 1当且仅当群的Poincaré指数> 1.此外,Ω(G)的一个单连通分支要么是圆盘,要么在\partial Ω的(内)切点的一维测度为零的意义下具有不可微边界.几乎每一点(关于调和测度)都是扭点。

英文摘要:

Let G be a non-elementary, finitely generated Kleinian group, Lambda(G) its limit set and Omega(G) = S \ Lambda(G) (S = the sphere) its set of discontinuity. Let delta(G) be the critical exponent for the Poincaré series and let Lambda_c be the conical limit set of G. Suppose Omega_0 is a simply connected component of Omega(G). We prove that (1) delta(G) = dim(Lambda_c). (2) A simply connected component Omega is either a disk or dim(Omega)>1$. (3) Lambda(G) is either totally disconnected, a circle or has dimension > 1, (4) G is geometrically infinite iff dim(Lambda)=2. (5) If G_n \to G algebraically then dim(Lambda) <= \liminf dim(Lambda_n). (6) The Minkowski dimension of Lambda equals the Hausdorff dimension. (7) If Area(Lambda)=0 then delta(G) = dim(Lambda(G)). The proof also shows that \dim(Lambda(G)) > 1 iff the conical limit set has dimension > 1 iff the Poincaré exponent of the group is > 1. Furthermore, a simply connected component of Omega(G) either is a disk or has non-differentiable boundary in the the sense that the (inner) tangent points of \partial Omega have zero 1-dimensional measure. Almost every point (with respect to harmonic measure) is a twist point.

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