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arXiv 1909.05945math.AGmath.AT
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光滑平面四次曲线的二重切线的丰富计数

An enriched count of the bitangents to a smooth plane quartic curve

Hannah Larson, Isabel Vogt

摘要:

Kass-Wickelgren最近的工作给出了任意域上光滑三次曲面上的$27$线的丰富计数。他们使用$\mathbb{A}^1$ -枚举几何的方法表明,当答案被计算为相对可定向向量丛的欧拉类的度时,其他经典的枚举问题应该有类似的丰富。在这里,我们考虑密切相关的问题的$28$双切光滑平面四次。然而,事实证明,相关的向量丛不是相对可定向的,并且需要新的想法来产生丰富的计数。我们引入了一个固定的“无穷远直线”,这导致了丰富的计数的双切线,这取决于他们的几何相对于四次线和这条杰出的线。

英文摘要:

Recent work of Kass--Wickelgren gives an enriched count of the $27$ lines on a smooth cubic surface over arbitrary fields. Their approach using $\mathbb{A}^1$-enumerative geometry suggests that other classical enumerative problems should have similar enrichments, when the answer is computed as the degree of the Euler class of a relatively orientable vector bundle. Here, we consider the closely related problem of the $28$ bitangents to a smooth plane quartic. However, it turns out the relevant vector bundle is not relatively orientable and new ideas are needed to produce enriched counts. We introduce a fixed "line at infinity," which leads to enriched counts of bitangents that depend on their geometry relative to the quartic and this distinguished line.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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