3-manifold groups are virtually residually p

Details 3-manifold groups are virtually residually p 3-manifold groups are virtually residually p

2010-04-21

arxiv.org/abs/1004.3619v3

Mathematics

Geometric Topology

Scientific paper

Given a prime $p$, a group is called residually $p$ if the intersection of its $p$-power index normal subgroups is trivial. A group is called virtually residually $p$ if it has a finite index subgroup which is residually $p$. It is well-known that finitely generated linear groups over fields of characteristic zero are virtually residually $p$ for all but finitely many $p$. In particular, fundamental groups of hyperbolic 3-manifolds are virtually residually $p$. It is also well-known that fundamental groups of 3-manifolds are residually finite. In this paper we prove a common generalization of these results: every 3-manifold group is virtually residually $p$ for all but finitely many $p$. This gives evidence for the conjecture (Thurston) that fundamental groups of 3-manifolds are linear groups.

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