NTP₂中的一些NIP-like现象
Some NIP-like phenomena in NTP$_{2}$
AI总结:
本文研究了NTP₂中的NIP-like现象,提出了NTP₂-光滑度量和distality概念,并探讨了有限交替定理及有限可满足性在NTP₂中的扩展问题。
摘要:
我们引入了NTP₂-光滑度量的概念,并证明在假设NTP₂的情况下它们存在。利用这一概念,我们提出了NTP₂中的distality概念,不幸的是,这一概念在简单理论中并不平凡地相交。随后,我们为NTP₂的一个子类证明了一个有限交替定理,该子类包含坚韧理论。在最后一部分,我们证明在NIP条件下,任何类型在奇异大小模型上的类型在较小模型中可有限满足,并询问在NTP₂中是否有一个平行的结果(用非分叉代替有限可满足性)是否成立。
英文摘要:
We introduce the notion of an NTP$_{2}$-smooth measure and prove that they exist assuming NTP$_{2}$. Using this, we propose a notion of distality in NTP$_{2}$ that unfortunately does not intersect simple theories trivially. We then prove a finite alternation theorem for a subclass of NTP$_{2}$ that contains resilient theories. In the last section we prove that under NIP, any type over a model of singular size is finitely satisfiable in a smaller model, and ask if a parallel result (with non-forking replacing finite satisfiability) holds in NTP$_{2}$.
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