Mathematics – Geometric Topology
Scientific paper
2007-01-24
Mathematics
Geometric Topology
23 pages. This version incorporates suggestions from the referee and adds a new section giving examples showing that the main
Scientific paper
If M is a closed simple 3-manifold whose fundamental group contains a genus-g surface group for some g>1, and if the dimension of H_1(M;Z_2) is at least max(3g-1,6), we show that M contains a closed, incompressible surface of genus at most g. This improves the main topological result of part I, in which the the same conclusion was obtained under the stronger hypothesis that the dimension of H_1(M;Z_2) is at least 4g-1. As an application we show that if M is a closed orientable hyperbolic 3-manifold with volume at most 3.08, then H_1(M;Z_2) has dimension at most 5.
Culler Marc
Shalen Peter B.
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