Finite Undecidability in Fields II: PAC, PRC and PpC Fields
Finite Undecidability in Fields II: PAC, PRC and PpC Fields
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领域 II 中的有限不可判定性:PAC、PRC 和 PpC 领域
DOI:
10.1215/00294527-2019-0002
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发表时间:
2022
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影响因子:
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通讯作者:
B. Tyrrell
中科院分区:
文献类型:
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作者:
B. Tyrrell
A field $K$ in a ring language $\mathcal{L}$ is finitely undecidable if $\mbox{Cons}(\Sigma)$ is undecidable for every nonempty finite $\Sigma \subseteq \mbox{Th}(K; \mathcal{L})$. We adapt arguments originating with Cherlin-van den Dries-Macintyre/Ershov (for PAC fields) and Haran (for PRC fields) to prove all PAC and PRC fields are finitely undecidable. We describe the difficulties that arise in adapting the proof to P$p$C fields, and show no bounded P$p$C field is finitely axiomatisable. This work is drawn from the author's PhD thesis and is a sequel to arXiv:2210.12729.