On Basis-Conjugating Automorphisms of Free Groups

On Basis-Conjugating Automorphisms of Free Groups
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基于自由群的共轭自同构

DOI:
10.4153/cjm-1986-073-3
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发表时间:
1986
期刊:
Canadian Journal of Mathematics
影响因子:
--
通讯作者:
J. McCool
J. McCool
中科院分区:
--
文献类型:
--
作者:
J. McCool

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设X = {x1,... xn }是自由群Fn的一个自由生成集,H是Aut Fn的一个子群,它由自同构α组成,使得对i = 1,2,...,n,α(xi)与xi共轭.我们称H为AutFn的Z-共轭子群。在[1]汉弗莱斯发现了一个生成集的同构副本H 1的H组成的尼尔森变换,其中每一个是共轭的ui(见备注1以下)。本文的目的是找到一个介绍H(因此H1)。设i ∈ j是{1,2,.,n}的元素。我们用(xi ; xj)表示Fn的自同构,如果k ≠ i,则将xi发送到xk并固定xk。设S是所有这样的自同构的集合。
Let X = {x 1, … xn } be a free generating set of the free group Fn and let H be the subgroup of Aut Fn consisting of those automorphisms α such that α(xi ) is conjugate to xi for each i = 1, 2 , …, n. We call H the Z-conjugating subgroup of Aut Fn . In [1] Humphries found a generating set for the isomorphic copy H 1 of H consisting of Nielsen transformations where each is conjugate to ui (see remark 1 below). The purpose of this paper is to find a presentation of H (and hence of H 1). Let i ≠ j be elements of {1, 2, …, n}. We denote by (xi ; xj ) the automorphism of Fn which sends xi to and fixes xk if k ≠ i. Let S be the set of all such automorphisms.