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arXiv 1601.05692math.LO
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稳定群与$(\mathbb{Z},+,0)$的扩张

Stable groups and expansions of $(\mathbb{Z},+,0)$

Gabriel Conant, Anand Pillay

摘要:

证明了如果$G$是一个有限权的充分饱和稳定群,且不含无限指数的可定义子群链,则$G$是有限$U$秩的超稳定群.结合Palacin和Sklinos最近的工作,我们得出结论:$(\mathbb{Z},+,0)$不存在有限权的适当稳定展开式.这个结果的一个推论是,如果$P\subseteq\mathbb{Z}^n$在$(\mathbb{Z},+,0)$的有限dp秩展开式中是可定义的,并且$(\mathbb{Z},+,0,P)$是稳定的,则$P$在$(\mathbb{Z},+,0)$中是可定义的。特别是,这回答了一个问题的标记稳定的扩大组的整数集定义在Presburger算术。

英文摘要:

We show that if $G$ is a sufficiently saturated stable group of finite weight with no infinite, infinite-index, chains of definable subgroups, then $G$ is superstable of finite $U$-rank. Combined with recent work of Palacin and Sklinos, we conclude that $(\mathbb{Z},+,0)$ has no proper stable expansions of finite weight. A corollary of this result is that if $P\subseteq\mathbb{Z}^n$ is definable in a finite dp-rank expansion of $(\mathbb{Z},+,0)$, and $(\mathbb{Z},+,0,P)$ is stable, then $P$ is definable in $(\mathbb{Z},+,0)$. In particular, this answers a question of Marker on stable expansions of the group of integers by sets definable in Presburger arithmetic.

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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