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### 4-Manifolds are Broken, Achiral, Lefschetz Fibrations

**Geometry/Topology**

Speaker: | Robion Kirby, Univ Cal Berkeley |

Location: | 2112 MSB |

Start time: | Wed, May 23 2007, 4:10PM |

The talk will mostly consist of an explanation of the terms in the theorem of the title. In particular, I'll begin with a description of elliptic surfaces as Lefschetz fibrations which will take much of the hour, and then the generalizations to achiral and broken.