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Ordinals arising as residual finiteness depths

Abstract:

For every natural number n, there exist finitely presented groups with residual finiteness depths ω⋅n and ω⋅n+1. The ordinals that arise as the residual finiteness depth of a finitely generated group (equivalently, a countable group) are 0, 1, the countable limit ordinals, and the successors of these limit ordinals.

Publication status:
Published
Peer review status:
Peer reviewed

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Files:
Publisher copy:
10.4171/rmi/1569

Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Mathematical Institute
Oxford college:
Magdalen College
Role:
Author
ORCID:
0000-0002-0080-9059


Publisher:
EMS Press
Journal:
Revista Matemática Iberoamericana More from this journal
Volume:
42
Issue:
2
Pages:
633–646
Publication date:
2025-06-18
Acceptance date:
2025-05-27
DOI:
EISSN:
2235-0616
ISSN:
0213-2230


Language:
English
Keywords:
Pubs id:
2127245
Local pid:
pubs:2127245
Deposit date:
2025-05-30
ARK identifier:

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