COUNTABLE MODELS OF THE THEORIES OF BALDWIN–SHI HYPERGRAPHS AND THEIR REGULAR TYPES
COUNTABLE MODELS OF THE THEORIES OF BALDWIN–SHI HYPERGRAPHS AND THEIR REGULAR TYPES
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鲍德温·希超图理论的可数模型及其正则类型
DOI:
10.1017/jsl.2019.28
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
GUNATILLEKA, DANUL K.
中科院分区:
文献类型:
--
作者:
GUNATILLEKA, DANUL K.
We continue the study of the theories of Baldwin–Shi hypergraphs from [5]. Restricting our attention to when the rank δ is rational valued, we show that each countable model of the theory of a given Baldwin–Shi hypergraph is isomorphic to a generic structure built from some suitable subclass of the original class used in the construction. We introduce a notion of dimension for a model and show that there is a an elementary chain . We also study the regular types that appear in these theories and show that the dimension of a model is determined by a particular regular type. Further, drawing on a large body of work, we use these structures to give an example of a pseudofinite, ω-stable theory with a nonlocally modular regular type, answering a question of Pillay in [11].
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1996
期刊:
Journal of Symbolic Logic (JSL)
影响因子:
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作者:
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通讯作者:
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