Generic stability, forking, and þ-forking

Generic stability, forking, and þ-forking
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通用稳定性、分叉和 þ 分叉

DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
A. Usvyatsov
A. Usvyatsov
中科院分区:
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文献类型:
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作者:
Darío García;A. Onshuus;A. Usvyatsov

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“小“的概念是模型论为任意结构的分析提供的最重要的工具之一。这类最有用的两个概念是分叉(与某些测度零理想密切相关)和叉刺(推广了通常的拓扑维数)。在某些温和的假设下,分叉是小的最好的概念,而荆棘分叉是粗糙的。在本文中,我们研究分叉和刺分叉,限制自己的类的一般稳定的类型。我们的主要结论是,在这方面,这两个概念是一致的。我们探讨了这种等价性的一些应用。
notions of " smallness " are among the most important tools that model theory offers for the analysis of arbitrary structures. The two most useful notions of this kind are forking (which is closely related to certain measure zero ideals) and thorn-forking (which generalizes the usual topological dimension). Under certain mild assumptions, forking is the finest notion of smallness, whereas thorn-forking is the coarsest. In this paper we study forking and thorn forking, restricting ourselves to the class of generically stable types. Our main conclusion is that in this context these two notions coincide. We explore some applications of this equivalence.
关于 NIP 和不变测度
DOI: 10.4171/jems/274
发表时间: 2011
影响因子: 2.6
作者:
Pillay A
通讯作者: Pillay A