ON RANK NOT ONLY IN NSOP 1 THEORIES

ON RANK NOT ONLY IN NSOP 1 THEORIES
复制标题

排名不仅在 NSOP 1 理论中

DOI:
10.1017/jsl.2024.9
复制
发表时间:
2024
期刊:
The Journal of Symbolic Logic
影响因子:
--
通讯作者:
DOBROWOLSKI J
DOBROWOLSKI J
中科院分区:
--
文献类型:
--
作者:
DOBROWOLSKI J

文献摘要

相似文献

我们引入了一族局部秩族,它依赖于形式为的对的有限集合Q,其中有一个公式并且是一个整体类型。我们证明了在任何NSOP理论中,这些列满足一些理想的性质;特别地,对于任何有限元变量x和任何Q,如果是类型的Kim-forking扩张,则对于某个q是Kim-非forking扩张,则对于每个只涉及Morley幂为-平稳的不变类型的Q。我们给出了一些NSOP理论中满足这一性质的不变类型族的自然例子。
We introduce a family of local ranksdepending on a finite set Q of pairs of the formwhereis a formula andis a global type. We prove that in any NSOPtheory these ranks satisfy some desirable properties; in particular,for any finite tuple of variables x and any Q, ifis a Kim-forking extension of types, thenfor some Q, and ifis a Kim-non-forking extension, thenfor every Q that involves only invariant types whose Morley powers are-stationary. We give natural examples of families of invariant types satisfying this property in some NSOPtheories.