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A Lower Bound on the Euler–Poincaré Characteristic of Certain Surfaces of General Type with a Linear Pencil of Hyperelliptic Curves
Published online by Cambridge University Press: 20 November 2018
Abstract
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Let $S$ be a surface of general type. In this article, when there exists a relatively minimal hyperelliptic fibration $f:\,S\,\to \,{{\mathbb{P}}^{1}}$ whose slope is less than or equal to four, we give a lower bound on the Euler–Poincaré characteristic of $S$. Furthermore, we prove that our bound is the best possible by giving required hyperelliptic fibrations.
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