Coordinates: | JH Michell Theatre in the Richard Berry Building |

Speaker: |
Shicheng Wang (Peking University) |

Title: |
Graph manifolds have virtually positive Seifert volume |

Abstract: |
(Joint work with Pierre Derbez.)
The Seifert volume of each closed non-trivial graph manifold is virtually positive. Then for each closed orientable 3-manifold N, the set of mapping degrees D(M,N) is finite for any 3-manifold M, unless each prime factor of N is finitely covered by either a torus bundle, or a trivial circle bundle, or the 3-sphere. |