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:
影响因子:
--
通讯作者:
M. Handel
中科院分区:
文献类型:
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作者:
Mark Feighn;M. Handel
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.