We show that if M is a surface bundle over S1 with fiber of genus
2, then for any integer n, M has a finite cover ~M with
b1(~M)>n. A corollary is that M can be geometrized using
only the "non-fiber" case of Thurston's Geometrization Theorem for
Haken manifolds.
Keywords
3–manifold, geometrization, virtual
Betti number, genus 2 surface bundle
Received: 15 January 2002
Revised: 9 August 2002
Accepted: 19 November 2002
Published: 24 November 2002
Proposed: Walter Neumann
Seconded: Cameron Gordon, Joan Birman