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Automorphisms of an irregular surface of general type acting trivially in cohomology, III

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Let S be a complex nonsingular minimal projective surface of general type. In this note we show that any automorphism of S of order three acts faithfully on \(H^2(S, \mathbb {Q})\) provided that \(q(S)\ge 3\). In the case \(q(S)=2\), the classification for surfaces with an automorphism of order 3 acting trivially on \(H^2(S, \mathbb Q)\) is given. We also construct surfaces S with such an automorphism.

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Acknowledgements

The author is grateful to the referee for several helpful comments.

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Correspondence to Jin-Xing Cai.

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This work was supported by the NSFC (Nos. 11471020, 11971399).

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Cai, JX. Automorphisms of an irregular surface of general type acting trivially in cohomology, III. manuscripta math. 164, 489–507 (2021). https://doi.org/10.1007/s00229-020-01192-4

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  • DOI: https://doi.org/10.1007/s00229-020-01192-4

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