English

A new counterexample to Nguyen's conjecture on surface fibration

Algebraic Geometry 2025-01-31 v3

Abstract

Suppose f:SP1f:S\rightarrow\mathbb{P}^1 is a surface fibration of genus gg with 33 singular fibers. If two of the singular fibers are semistable, Nguyen conjectured that ff does not exist for g2g\ge2. However, a counterexample for g=2g=2 was discovered by Gong-Lu-Tan. Note that such kind of surface fibrations admit strong arithmetic properties but are rare in fact, and as such the counterexamples are important. In this paper, we construct a new one for g=2g=2.

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Cite

@article{arxiv.1811.10421,
  title  = {A new counterexample to Nguyen's conjecture on surface fibration},
  author = {Wenyi Cai and Yuanyuan Qian and Hao Xiao and Lingyu Zhuo},
  journal= {arXiv preprint arXiv:1811.10421},
  year   = {2025}
}

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6 pages