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有理函数在有理点处的有理值与整数值

Rational and integral values of rational functions at rational points

Pietro Corvaja, Umberto Zannier, appendix by D. Masser

arXiv 2608.28255首次发表:更新:

AI 中文总结

该研究针对代数 variety 上有理函数在有理点处的值集问题,证明阿贝尔 variety 的有理点映射非满射,构造反例推翻经典希尔伯特性质相关预期,并讨论最大公约数估计等内容。

AI 中文摘要

核心问题涉及代数 variety 的有理点处有理函数的值集,即像集 f(X(k)),其中 X 是代数 variety,f 是 X 上的有理函数,定义在数域 k 上。例如,我们将证明当 X 为阿贝尔 variety 时,其有理点间的映射绝非满射,这与希尔伯特性质类似,但此处纤维可具有任意维数。我们的一个例子涉及经典希尔伯特性质:构造了一个单连通仿射曲面,其整数值集为扎里斯基稠密且薄的,推翻了一个合理的预期。我们还将讨论高度与整性问题,在此背景下,“最大公约数(gcd)估计”将发挥作用。由 D. Masser 撰写的第一个附录中,提供了某些相关最大公约数的有效估计。

英文摘要

The basic issue concerns sets of values of rational functions at rational points of an algebraic variety, namely image f(X(k)), where X is an algebbaric variety and f is a rational function on X, defined over the number field k. For instance, we shall prove that for X an abelian variety, the map between rational points is never surjective. This is reminiscent of the Hilbert Property, but here the fibers may have arbitrary dimension. One of our examples concerns the classical Hilbert Property: we produce a simply connected affine surface whose set of integral points is Zariski-dense and thin, disproving a plausible expectation. We shall also discuss hieghts and integrality issues; in this context, a role will be played by 'gcd estimates'. In the first Appendix, written by D. Masser, an effective estimate of some relevant gcd is provided.

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