Geodesic
Hyperbolic hydra
Noel Brady1 ; Will Dison2 ; Timothy R. Riley3
1University of Oklahoma, Norman, United States
2Bank of England, London, UK
3Cornell University, Ithaca, USA
Groups, geometry, and dynamics, Tome 7 (2013) no. 4, pp. 961-976

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DOI

We give examples of hyperbolic groups with finite rank free subgroups of huge (Ackermannian) distortion.
DOI : 10.4171/ggd/212
Classification : 20-XX
Mots-clés : Hyperbolic group, subgroup distortion, hydra, Ackermann's function

Noel Brady  1   ; Will Dison  2   ; Timothy R. Riley  3

1 University of Oklahoma, Norman, United States
2 Bank of England, London, UK
3 Cornell University, Ithaca, USA 
Noel Brady; Will Dison; Timothy R. Riley. Hyperbolic hydra. Groups, geometry, and dynamics, Tome 7 (2013) no. 4, pp. 961-976. doi: 10.4171/ggd/212
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     title = {Hyperbolic hydra},
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     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/212/}
}
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