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arXiv 0912.2591math.LO
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简单理论的模型论Baire范畴定理

A model theoretic Baire category theorem for simple theories

Ziv Shami

摘要:

证明了在可列简单理论中关于$\tildeτ_{low}^f$ -集的模型论Baire范畴定理,其中扩张性质是一阶的,并给出了它的一些应用.我们还证明了可数nfcp理论中的极小类型的一个可分性:要么每一个类型是内部的极小类型基本上是1-为基础的分叉拓扑或$T$解释一个无限的可定义的1-为基础的有限$D$ -秩或$T$解释一个强极小公式。

英文摘要:

We prove a model theoretic Baire category theorem for $\tildeτ_{low}^f$-sets in a countable simple theory in which the extension property is first-order and show some of its applications. We also prove a trichotomy for minimal types in countable nfcp theories: either every type that is internal in a minimal type is essentially-1-based by means of the forking topology or $T$ interprets an infinite definable 1-based group of finite $D$-rank or $T$ interprets a strongly-minimal formula.

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