Lefschetz Fibrations and an Invariant of Finitely Presented Groups


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KORKMAZ M.

INTERNATIONAL MATHEMATICS RESEARCH NOTICES, sa.9, ss.1547-1572, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Basım Tarihi: 2009
  • Doi Numarası: 10.1093/imrn/rnn164
  • Dergi Adı: INTERNATIONAL MATHEMATICS RESEARCH NOTICES
  • Sayfa Sayıları: ss.1547-1572

Özet

Every finitely presented group is the fundamental group of the total space of a Lefschetz fibration. This follows from results of Gompf and Donaldson, and was also proved by Amoros-Bogomolov-Katzarkov-Pantev. We give another proof by providing the monodromy explicitly. We then define the genus of a finitely presented group Gamma to be the minimal genus of a Lefschetz fibration with fundamental group Gamma. We also give some estimates of the genus of certain groups.