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arXiv 1702.08281math.LO
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$\aleph_0$中稳定的抽象初等类

Abstract elementary classes stable in $\aleph_0$

Saharon Shelah, Sebastien Vasey

摘要:

我们研究抽象的基本类(AEC),在$\aleph_0$,合并,联合嵌入,没有最大模型,是稳定的(在轨道类型的数量方面)。假设类型的局部属性,我们证明了这样的类表现出超稳定的行为在$\aleph_0$。更确切地说,存在基数的超极限模型$\aleph_0$,并且由该超极限生成的类具有类型完整的好$\aleph_0$ -框架(非分叉独立性的局部概念)和基数的超极限模型$\aleph_1$。我们还给出了一个超简单的条件下,局域性假设如下从休息。

英文摘要:

We study abstract elementary classes (AECs) that, in $\aleph_0$, have amalgamation, joint embedding, no maximal models and are stable (in terms of the number of orbital types). Assuming a locality property for types, we prove that such classes exhibit superstable-like behavior at $\aleph_0$. More precisely, there is a superlimit model of cardinality $\aleph_0$ and the class generated by this superlimit has a type-full good $\aleph_0$-frame (a local notion of nonforking independence) and a superlimit model of cardinality $\aleph_1$. We also give a supersimplicity condition under which the locality hypothesis follows from the rest.

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