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arXiv math/0602520math.GT
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双曲三维流形的PL-方法证明驯服性

The PL-methods for hyperbolic 3-manifolds to prove tameness

Suhyoung Choi

摘要:

利用PL-方法证明了Marden猜想:具有双曲生成的基本群且不含抛物线的双曲三维流形$M$是拓扑驯服的.我们的方法是形成一个耗尽$M_i$的$M$和修改的边界,使他们2-凸。我们利用诱导路径度量,使得子流形$M_i$负弯曲,且具有与$i$无关的Margulis常数.通过取$M_i$的覆盖中对应于核的凸包,我们证明了存在一个存在的曲面序列$Σ_i$ .有些想法遵循阿戈尔的想法。我们再次通过一个核心$\core$钻去$M_i$的覆盖层,使其负弯曲。然后证明了$Σ_i$凸包的边界与核相交。利用Souto的紧性论证,我们证明了在$M - \core^o$中无穷多个$Σ_i$是同伦的.我们的方法应该推广到更广泛的一类分段双曲流形。

英文摘要:

Using PL-methods, we prove the Marden's conjecture that a hyperbolic 3-manifold $M$ with finitely generated fundamental group and with no parabolics are topologically tame. Our approach is to form an exhaustion $M_i$ of $M$ and modify the boundary to make them 2-convex. We use the induced path-metric, which makes the submanifold $M_i$ negatively curved and with Margulis constant independent of $i$. By taking the convex hull in the cover of $M_i$ corresponding to the core, we show that there exists an exiting sequence of surfaces $Σ_i$. Some of the ideas follow those of Agol. We drill out the covers of $M_i$ by a core $\core$ again to make it negatively curved. Then the boundary of the convex hull of $Σ_i$ is shown to meet the core. By the compactness argument of Souto, we show that infinitely many of $Σ_i$ are homotopic in $M - \core^o$. Our method should generalize to a more wider class of piecewise hyperbolic manifolds.

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