Tohoku Mathematical Journal

Fibers of cyclic covering fibrations of a ruled surface

Makoto Enokizono

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We give an algorithm to classify singular fibers of finite cyclic covering fibrations of a ruled surface by using singularity diagrams. As the first application, we classify all fibers of 3-cyclic covering fibrations of genus 4 of a ruled surface and show that the signature of a complex surface with this fibration is non-positive by computing the local signature for any fiber. As the second application, we classify all fibers of hyperelliptic fibrations of genus 3 into 12 types according to the Horikawa index. We also prove that finite cyclic covering fibrations of a ruled surface have no multiple fibers if the degree of the covering is greater than 3.

Article information

Tohoku Math. J. (2), Volume 71, Number 3 (2019), 327-358.

First available in Project Euclid: 18 September 2019

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Digital Object Identifier

Mathematical Reviews number (MathSciNet)

Primary: 14D06: Fibrations, degenerations

fibered surface singular fiber cyclic covering


Enokizono, Makoto. Fibers of cyclic covering fibrations of a ruled surface. Tohoku Math. J. (2) 71 (2019), no. 3, 327--358. doi:10.2748/tmj/1568772176.

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