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Charts, signatures, and stabilizations of Lefschetz fibrations

Hisaaki Endo, Isao Hasegawa, Seiichi Kamada and Kokoro Tanaka

Geometry & Topology Monographs 19 (2015) 237–267

arXiv: 1403.7946


We employ a certain labeled finite graph, called a chart, in a closed oriented surface to describe the monodromy of a(n achiral) Lefschetz fibration over the surface. Applying charts and their moves with respect to Wajnryb’s presentation of mapping class groups, we first generalize a signature formula for Lefschetz fibrations over the 2–sphere obtained by Endo and Nagami to that for Lefschetz fibrations over arbitrary closed oriented surface. We then prove two theorems on stabilization of Lefschetz fibrations under fiber summing with copies of a typical Lefschetz fibration as generalizations of a theorem of Auroux.

Lefschetz fibration, chart, signature, fiber sum, stabilization
Mathematical Subject Classification 2010
Primary: 57M15
Secondary: 57N13
Received: 17 April 2015
Accepted: 20 April 2015
Published: 29 December 2015
Hisaaki Endo
Department of Mathematics
Tokyo Institute of Technology
2-12-1 Oh-okayama
Tokyo 152-8551
Isao Hasegawa
Ministry of Health, Labour and Welfare
1-2-2 Kasumigaseki
Tokyo 100-8916
Seiichi Kamada
Department of Mathematics
Osaka City University
3-3-138 Sugimoto
Osaka 558-8585
Kokoro Tanaka
Department of Mathematics
Tokyo Gakugei University
4-1-1 Nukuikita-machi
Tokyo 184-8501