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arXiv 1808.01593math.AGmath.NT
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亏格超椭圆Jacobian的显式有理群律

Explicit Rational Group Law on Hyperelliptic Jacobians of any Genus

David Urbanik

摘要:

众所周知,阿贝尔簇是射影的,因此存在明确的多项式和有理函数来定义簇及其群律。然而,很难找到任何明确的多项式和有理函数来描述这些变量或它们在大于2维中的群律。一个例外可以在Mumford的经典“Lectures on Theta”中找到,在那里他描述了如何获得超椭圆Jacobian的显式模型,作为描述为显式多项式方程的消失轨迹的几个仿射片段的联合。在这篇文章中,我们推广了这一工作,给出了稠密开集上的群律的显式方程。人们可以把这些方程看作是椭圆曲线上通常的基于弦的群律的推广。

英文摘要:

It is well-known that abelian varieties are projective, and so that there exist explicit polynomial and rational functions which define both the variety and its group law. It is however difficult to find any explicit polynomial and rational functions describing these varieties or their group laws in dimensions greater than two. One exception can be found in Mumford's classic "Lectures on Theta", where he describes how to obtain an explicit model for hyperelliptic Jacobians as the union of several affine pieces described as the vanishing locus of explicit polynomial equations. In this article, we extend this work to give explicit equations for the group law on a dense open set. One can view these equations as generalizations of the usual chord-based group law on elliptic curves.

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