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Four-free groups and hyperbolic geometry

Marc Culler (University of Illinois at Chicago) Peter B. Shalen (University of Illinois at Chicago)
Arxiv ID: 0806.1188Last updated: 11/4/2020
We give new information about the geometry of closed, orientable hyperbolic 3-manifolds with 4-free fundamental group. As an application we show that such a manifold has volume greater than 3.44. This is in turn used to show that if M is a closed orientable hyperbolic 3-manifold such that vol M < 3.44, then H_1(M;Z/2Z) has dimension at most 7.

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