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math.GR2024
Ordinals arising as residual finiteness depths
Martin R. Bridson
For every natural number , there exist finitely presented groups with residual finiteness depths and . The ordinals that arise as the residual finitenes…
math.GR2024★ 1 cited
Profinite rigidity for free-by-cyclic groups with centre
Martin R. Bridson, Paweł Piwek
A free-by-cyclic group has non-trivial centre if and only if has finite order in . We establish a profinite ridigity result for such…