arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1509.01488math.LO
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关于合并的范畴抽象初等类的结构

On the structure of categorical abstract elementary classes with amalgamation

Monica M. VanDieren, Sebastien Vasey

摘要:

对于$K$一个抽象的基本类合并,没有最大的模型,我们表明,在一个足够高的基数范畴意味着结构特性,如极限模型的唯一性和良好的框架的存在。这改进了Shelah的几个经典结果。让$\mathbf{Theorem}$。如果$K$在$λ\ge \beth_{\left(2^μ\right)^+}$中是范畴的,则:1)每当$M_0, M_1, M_2 \in K_μ$使得$M_1$和$M_2$在$M_0$上是极限时,我们有$M_1 \cong_{M_0} M_2$。2)如果为$μ> \text{LS} (K)$,则大小为$λ$的模型为$μ$ -饱和。3)如果$μ\ge \beth_{(2^{\text{LS} (K)})^+}$和$λ\ge \beth_{\left(2^{μ^+}\right)^+}$,则存在一个类型完全的好$μ$ -框架,其基础类是$K_μ$中的饱和模型。我们的主要工具是分裂的对称性(先前由第一作者隔离)。关键引理从序性质的失效中推导出对称性。

英文摘要:

For $K$ an abstract elementary class with amalgamation and no maximal models, we show that categoricity in a high-enough cardinal implies structural properties such as the uniqueness of limit models and the existence of good frames. This improves several classical results of Shelah. $\mathbf{Theorem}$ Let $μ\ge \text{LS} (K)$. If $K$ is categorical in a $λ\ge \beth_{\left(2^μ\right)^+}$, then: 1) Whenever $M_0, M_1, M_2 \in K_μ$ are such that $M_1$ and $M_2$ are limit over $M_0$, we have $M_1 \cong_{M_0} M_2$. 2) If $μ> \text{LS} (K)$, the model of size $λ$ is $μ$-saturated. 3) If $μ\ge \beth_{(2^{\text{LS} (K)})^+}$ and $λ\ge \beth_{\left(2^{μ^+}\right)^+}$, then there exists a type-full good $μ$-frame with underlying class the saturated models in $K_μ$. Our main tool is the symmetry property of splitting (previously isolated by the first author). The key lemma deduces symmetry from failure of the order property.

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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