ON RANK NOT ONLY IN NSOP 1 THEORIES
ON RANK NOT ONLY IN NSOP 1 THEORIES
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排名不仅在 NSOP 1 理论中
DOI:
10.1017/jsl.2024.9
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发表时间:
2024
期刊:
影响因子:
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通讯作者:
DOBROWOLSKI J
中科院分区:
文献类型:
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作者:
DOBROWOLSKI J
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.