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arXiv 2405.09275math.LO
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Feferman的完备性定理

Feferman's completeness theorem

Fedor Pakhomov, Michael Rathjen, Dino Rossegger

AI总结:

本文旨在通过提供Feferman完备性定理的两个新证明来阐明该结果,并结合可计算结构理论为算术层级各层完备性所需的良序序型给出精确界限。

摘要:

Feferman于1962年证明,任何算术定理都是PA的完全一致反射的适当超限迭代的结果。这一结果通常被称为Feferman的完备性定理。本文的目的有两方面。一方面,这是一篇阐述性论文,给出了Feferman完备性定理的两个新证明,我们希望这能阐明这一神秘且常被忽视的结果。另一方面,我们将其中一个证明与Ash和Knight的可计算结构理论结果相结合,为达到算术层级各层完备性所需的良序的序型给出了精确界限。

英文摘要:

Feferman proved in 1962 that any arithmetical theorem is a consequence of a suitable transfinite iteration of full uniform reflection of $\mathsf{PA}$. This result is commonly known as Feferman's completeness theorem. The purpose of this paper is twofold. On the one hand this is an expository paper, giving two new proofs of Feferman's completeness theorem that, we hope, shed light on this mysterious and often overlooked result. On the other hand, we combine one of our proofs with results from computable structure theory due to Ash and Knight to give sharp bounds on the order types of well-orders necessary to attain the completeness for levels of the arithmetical hierarchy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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