Commutators, Lefschetz fibrations and the signatures of surface bundles


Endo H., Korkmaz M. , Kotschick D., Ozbagci B., Stipsicz A.

TOPOLOGY, cilt.41, sa.5, ss.961-977, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

We construct examples of Lefschetz fibrations with prescribed singular fibers. By taking differences of pairs of such fibrations with the same singular fibers, we obtain new examples of surface bundles over surfaces with nonzero signature. From these we derive new upper bounds for the minimal genus of a surface representing a given element in the second homology of a mapping class group. (C) 2002 Elsevier Science Ltd. All rights reserved.