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Tree almost automorphism groups: elements and subgroups Wesolek, Phillip
Description
(Joint work with A. Le Boudec) We begin by giving a detailed overview of the tree almost automorphism groups and describing their relationship to Higman-Thompson groups and topological full groups. We then show each almost automorphism has one of two possible types, corresponding to the dynamics of the action on the boundary. We next consider the subgroups such that every element is contained in a compact subgroup; such groups are the topological analogue of torsion subgroups. We characterize these subgroups in terms of the dynamics of their action on the boundary and deduce that they are indeed locally elliptic - i.e. every finite set is contained in a compact subgroup. We finally consider the commensurated subgroups of almost automorphism groups; these subgroups generalize normal subgroups. We show every commensurated closed subgroup of an almost automorphism group is either finite, compact and open, or equal to the entire group.
Item Metadata
Title |
Tree almost automorphism groups: elements and subgroups
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2017-06-13T10:30
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Description |
(Joint work with A. Le Boudec) We begin by giving a detailed overview of the tree almost automorphism groups and describing their relationship to Higman-Thompson groups and topological full groups. We then show each almost automorphism has one of two possible types, corresponding to the dynamics of the action on the boundary. We next consider the subgroups such that every element is contained in a compact subgroup; such groups are the topological analogue of torsion subgroups. We characterize these subgroups in terms of the dynamics of their action on the boundary and deduce that they are indeed locally elliptic - i.e. every finite set is contained in a compact subgroup. We finally consider the commensurated subgroups of almost automorphism groups; these subgroups generalize normal subgroups. We show every commensurated closed subgroup of an almost automorphism group is either finite, compact and open, or equal to the entire group.
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Extent |
52 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: Binghamton University
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Series | |
Date Available |
2017-12-11
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0361778
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Postdoctoral
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International