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- W2949231113 abstract "We study the minimal complex surfaces of general type with $p_g=0$ and $K^2=7$ or 8 whose bicanonical map is not birational. In the paper 'The bicanonical map of surfaces with $p_g=0$ and $K^2ge 7$' we have shown that if $S$ is such a surface, then the bicanonical map has degree 2. Here we describe precisely such surfaces showing that there is a fibration $fcolon Sto pp^1$ such that: i) the general fibre $F$ of $f$ is a genus 3 hyperelliptic curve; ii) the involution induced by the bicanonical map of $S$ restricts to the hyperelliptic involution of $F$. Furthermore, if $K^2_S=8$, then $f$ is an isotrivial fibration with 6 double fibres, and if $K^2_S=7$, then $f$ has 5 double fibres and it has precisely one fibre with reducible support, consisting of two components." @default.
- W2949231113 created "2019-06-27" @default.
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- W2949231113 date "1999-10-14" @default.
- W2949231113 modified "2023-09-27" @default.
- W2949231113 title "The bicanonical map of surfaces with $p_g=0$ and $K^2ge 7$, II" @default.
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