Adding linear orders

Adding linear orders
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添加线性阶次

DOI:
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发表时间:
2011
期刊:
Journal of Symbolic Logic (JSL)
影响因子:
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通讯作者:
Pierre Simon
Pierre Simon
中科院分区:
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文献类型:
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作者:
S. Shelah;Pierre Simon

文献摘要

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摘要:我们讨论以下问题:我们是否可以通过添加线性阶来扩展NIP理论,使其扩展仍然是NIP?很容易,如果acl(A)=A对于所有A,那么这是真的。否则,我们给出反例。更准确地说,存在一个完全的范畴理论,对于这个理论,每一个线性级数的展开都有IP。还有一个ω稳定的NDOP理论,它的每一个线性阶展开都解释了伪有限算法。
Abstract We address the following question: Can we expand an NIP theory by adding a linear order such that the expansion is still NIP? Easily, if acl(A)=A for all A, then this is true. Otherwise, we give counterexamples. More precisely, there is a totally categorical theory for which every expansion by a linear order has IP. There is also an ω-stable NDOP theory for which every expansion by a linear order interprets pseudofinite arithmetic.