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arXiv 2008.06235math.NT
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期望值的局部到全局原则

Local to global principle for expected values

Giacomo Micheli, Severin Schraven, Violetta Weger

摘要:

本文构造了有限秩自由$\mathbb{Z}$ -模上期望值的一个新的局部到整体原理。在我们的策略中,我们使用了与Ekedhal的密度筛相同的哲学,后来Poonen和Stoll在他们的局部到全局密度原则中扩展和改进了它。我们表明,在一些额外的假设下,系统的$p$ -进子集中使用的原则,可以使用$p$ -进措施时,也必须计算期望值(而不仅仅是密度)。此外,我们表明,我们的额外的假设是尖锐的,在这个意义上,明确的反例存在时,他们中的任何一个是失踪。特别地,当人们对期望值而不是密度感兴趣时,在Poonen和Stoll原理中工作的$p$ -adic子集的系统不能保证工作。最后,我们提供了新的应用程序的方法,并立即证明已知的结果。

英文摘要:

This paper constructs a new local to global principle for expected values over free $\mathbb{Z}$-modules of finite rank. In our strategy we use the same philosophy as Ekedhal's Sieve for densities, later extended and improved by Poonen and Stoll in their local to global principle for densities. We show that under some additional hypothesis on the system of $p$-adic subsets used in the principle, one can use $p$-adic measures also when one has to compute expected values (and not only densities). Moreover, we show that our additional hypotheses are sharp, in the sense that explicit counterexamples exist when any of them is missing. In particular, a system of $p$-adic subsets that works in the Poonen and Stoll principle is not guaranteed to work when one is interested in expected values instead of densities. Finally, we provide both new applications of the method, and immediate proofs for known results.

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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