Journal title
Journal of the European Mathematical Society
DOI
10.4171/jems/900
Issue
10
Volume
21
Last updated
2024-04-08T01:21:55.797+01:00
Page
3191-3197
Abstract
We prove a converse to Myhill's "Garden-of-Eden" theorem and obtain in this
manner a characterization of amenability in terms of cellular automata: "A
group $G$ is amenable if and only if every cellular automaton with carrier $G$
that has gardens of Eden also has mutually erasable patterns."
This answers a question by Schupp, and solves a conjecture by
Ceccherini-Silberstein, Mach\`i and Scarabotti.
An appendix by Dawid Kielak proves that group rings without zero divisors are
Ore domains precisely when the group is amenable, answering a conjecture
attributed to Guba.
manner a characterization of amenability in terms of cellular automata: "A
group $G$ is amenable if and only if every cellular automaton with carrier $G$
that has gardens of Eden also has mutually erasable patterns."
This answers a question by Schupp, and solves a conjecture by
Ceccherini-Silberstein, Mach\`i and Scarabotti.
An appendix by Dawid Kielak proves that group rings without zero divisors are
Ore domains precisely when the group is amenable, answering a conjecture
attributed to Guba.
Symplectic ID
1118438
Submitted to ORA
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Publication type
Journal Article
Publication date
19 Jun 2019