Distortion and the automorphism group of a shift
Distortion and the automorphism group of a shift
复制标题
畸变与位移的自同构群
DOI:
10.3934/jmd.2018015
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
S. Petite
中科院分区:
文献类型:
--
作者:
Van Cyr;J. Franks;Bryna Kra;S. Petite
The set of automorphisms of a one-dimensional \shift $(X, \sigma)$ forms a countable, but often very complicated, group. For zero entropy shifts, it has recently been shown that the automorphism group is more tame. We provide the first examples of countable groups that cannot embed into the automorphism group of any zero entropy \shiftno. In particular, we show that the Baumslag-Solitar groups ${\rm BS}(1,n)$ and all other groups that contain exponentially distorted elements cannot embed into ${\rm Aut}(X)$ when $h_{\rm top}(X)=0$. We further show that distortion in nilpotent groups gives a nontrivial obstruction to embedding such a group in any low complexity shift.
影响因子:
1.3
作者:
Cyr, Van;Franks, John;Kra, Bryna
通讯作者:
Kra, Bryna