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arXiv 0810.1715math.NTmath.DS
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关于二次动力系统原点的有理迭代原像数

On the Number of Rational Iterated Pre-images of the Origin Under Quadratic Dynamical Systems

Xander Faber, Benjamin Hutz, Michael Stoll

摘要:

对于定义在有理数上的仿射直线的二次自同态,我们考虑迭代后最终落在原点的有理点的数目的边界问题。在文章“Uniform Bounds on Pre-Images Under quadratic动力系统,”由两位作者和另外五位作者,它表明,有理迭代原原像的数量是有界的,因为一个不同的态射在一定的一维家庭。根据Birch和Swinnerton-Dyer猜想以及其他一些关于某个特定阿贝尔簇的L-级数的相关猜想的有效性,并利用一些现代工具在高亏格曲线上定位有理点,我们证明了有理迭代原像的最大数目为6.我们还提供了进一步的洞察几何的“前图像曲线。''

英文摘要:

For a quadratic endomorphism of the affine line defined over the rationals, we consider the problem of bounding the number of rational points that eventually land at the origin after iteration. In the article ``Uniform Bounds on Pre-Images Under Quadratic Dynamical Systems,'' by two of the present authors and five others, it was shown that the number of rational iterated pre-images of the origin is bounded as one varies the morphism in a certain one-dimensional family. Subject to the validity of the Birch and Swinnerton-Dyer conjecture and some other related conjectures for the L-series of a specific abelian variety and using a number of modern tools for locating rational points on high genus curves, we show that the maximum number of rational iterated pre-images is six. We also provide further insight into the geometry of the ``pre-image curves.''

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