The generalised word problem for subgroups of hyperbolic groups
Derek F. Holt and Sarah Rees
Keywords
generalised word problem, hyperbolic groups, context-free language, real-time Turing machine
Status
Published in J. Algebra 516 (2018) 149--171.
Abstract
We prove that the generalised word problem of a finitely generated subgroup of
a finitely generated virtually free group is context-free, that a hyperbolic
group must be virtually free if it has a torsion-free quasiconvex subgroup of
infinite index with context-free generalised word problem, and that, for any
hyperbolic group, the generalised word problem of a torsion-free quasiconvex
subgroup is recognised by a real-time Turing machine.
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