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Notes on automorphisms of surfaces of general type with $p_g=0$ and $K^2=7$

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arxiv 1408.2254 v1 pith:UZJQRJTA submitted 2014-08-10 math.AG

classification math.AG
keywords mathbbautomorphismgeneralgroupinoueisomorphicsurfacesurfaces
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abstract

Let $S$ be a smooth minimal complex surface of general type with $p_g=0$ and $K^2=7$. We prove that any involution on $S$ is in the center of the automorphism group of $S$. As an application, we show that the automorphism group of an Inoue surface with $K^2=7$ is isomorphic to $\mathbb{Z}_2^2$ or $\mathbb{Z}_2 \times \mathbb{Z}_4$. We construct a $2$-dimensional family of Inoue surfaces with automorphism groups isomorphic to $\mathbb{Z}_2 \times \mathbb{Z}_4$.

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