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arXiv · 2005.08878

Covering gonalities of complete intersections in positive characteristic

Geoffrey Smith
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Abstract

We define the covering gonality and separable covering gonality of varieties over arbitrary fields, generalizing the definition given by Bastianelli-de Poi-Ein-Lazarsfeld-Ullery for complex varieties. We show that over an arbitrary field a smooth multidegree $(d_1,\ldots,d_k)$ complete intersection in $\mathbb{P}^N$ has separable covering gonality at least $d-N+1$, where $d=d_1+\cdots+d_k$. We also show that the very general such variety has covering gonality at least $\frac{d-N+2}{2}$.

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Geoffrey Smith. 2020-05-18. Covering gonalities of complete intersections in positive characteristic. https://doi.org/10.2140/ant.2022.16.731

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