Article contents
DECOMPOSITION THEOREMS FOR AUTOMORPHISM GROUPS OF TREES
Part of:
Locally compact groups and their algebras
Structure and classification of infinite or finite groups
Published online by Cambridge University Press: 20 May 2020
Abstract
Motivated by the Bruhat and Cartan decompositions of general linear groups over local fields, we enumerate double cosets of the group of label-preserving automorphisms of a label-regular tree over the fixator of an end of the tree and over maximal compact open subgroups. This enumeration is used to show that every continuous homomorphism from the automorphism group of a label-regular tree has closed range.
Keywords
MSC classification
Primary:
20E08: Groups acting on trees
- Type
- Research Article
- Information
- Bulletin of the Australian Mathematical Society , Volume 103 , Issue 1 , February 2021 , pp. 104 - 112
- Copyright
- © 2020 Australian Mathematical Publishing Association Inc.
Footnotes
This research was supported by the Australian Research Council grant FL170100032.
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