论文标题
自动形态的自动形态d'un Groupe de Coxeter Universel
Automorphismes du groupe des automorphismes d'un groupe de Coxeter universel
论文作者
论文摘要
使用免费产品的Guirardel-Levitt外层空间,我们证明了Universal Coxeter组的外部自动形态组的外部自动形态组是$ n \ geq 5 $的千层次,这是微不足道的,并且它是$ n = 4 $的订单2的环状组。此外,我们证明了通用Coxeter组的自动形态群体的外部自动形态组$ n \ geq 4 $是微不足道的。
Using the Guirardel-Levitt outer space of a free product, we prove that the outer automorphism group of the outer automorphism group of the universal Coxeter group of rank $n \geq 5$ is trivial, and that it is a cyclic group of order 2 if $n=4$. In addition we prove that the outer automorphism group of the automorphism group of the universal Coxeter group of rank $n \geq 4$ is trivial.