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arXiv 0912.4977math.NTmath.PR
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全球Cohen-Lenstra启发式

The Global Cohen-Lenstra Heuristic

Johannes Lengler

摘要:

Cohen-Lenstra启发式是一个普遍的原则,它为每个组分配一个概率,告诉这个组在“自然界”中应该出现的频率。最重要的,但不是唯一的,应用程序是序列的类组,其行为就像随机序列的群体相对于所谓的科恩-伦斯特拉概率测度。到目前为止,这是唯一可能的定义有限阿贝尔$p$ -群的概率测度。我们证明,它也可以定义一个类似的概率测度的集合上的\emph{all}有限阿贝尔群时,限制到$Σ$ -代数的集合上的所有有限阿贝尔群是由统一的属性,从而解决了一个问题,是开放的,因为1984年。

英文摘要:

The Cohen-Lenstra heuristic is a universal principle that assigns to each group a probability that tells how often this group should occur "in nature". The most important, but not the only, applications are sequences of class groups, which behave like random sequences of groups with respect to the so-called Cohen-Lenstra probability measure. So far, it was only possible to define this probability measure for finite abelian $p$-groups. We prove that it is also possible to define an analogous probability measure on the set of \emph{all} finite abelian groups when restricting to the $Σ$-algebra on the set of all finite abelian groups that is generated by uniform properties, thereby solving a problem that was open since 1984.

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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