On Basis-Conjugating Automorphisms of Free Groups
On Basis-Conjugating Automorphisms of Free Groups
复制标题
基于自由群的共轭自同构
DOI:
10.4153/cjm-1986-073-3
复制
发表时间:
1986
期刊:
影响因子:
--
通讯作者:
J. McCool
中科院分区:
文献类型:
--
作者:
J. McCool
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.