The Recognition Theorem for Out(F_n)

The Recognition Theorem for Out(F_n)
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Out(F_n) 的识别定理

DOI:
10.4171/ggd/116
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发表时间:
2006
期刊:
arXiv: Group Theory
影响因子:
--
通讯作者:
M. Handel
M. Handel
中科院分区:
--
文献类型:
--
作者:
Mark Feighn;M. Handel

文献摘要

被引文献

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我们的目标是找到完全确定秩为n的自由群$F_n$的外自同构群$\Out(F_n)$的元素的动态不变量。为了避免有限阶现象,我们对{\it forward rotationless}元素这样做。这不是一个严重的限制。例如,有$K_n>0$只依赖于$n$,使得对于所有$\phi\in\Out(F_n)$,$\phi^{K_n}$是无前向旋转的。我们的分析的一个重要部分是表明,无旋转元素表示特别好的相对列车轨道图。
Our goal is to find dynamic invariants that completely determine elements of the outer automorphism group $\Out(F_n)$ of the free group $F_n$ of rank $n$. To avoid finite order phenomena, we do this for {\it forward rotationless} elements. This is not a serious restriction. For example, there is $K_n>0$ depending only on $n$ such that, for all $\phi\in\Out(F_n)$, $\phi^{K_n}$ is forward rotationless. An important part of our analysis is to show that rotationless elements are represented by particularly nice relative train track maps.