Equivalents of the (Weak) Fan Theorem

Equivalents of the (Weak) Fan Theorem
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(弱)范定理的等价物

DOI:
10.1016/j.apal.2004.07.002
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发表时间:
2005
期刊:
Ann. Pure Appl. Log.
影响因子:
--
通讯作者:
I. Loeb
I. Loeb
中科院分区:
--
文献类型:
--
作者:
I. Loeb

文献摘要

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本文提出了一个弱的直觉二阶算法系统,WKV,它是S.C. Kleene, R.E. Vesley[直觉数学的基础:特别是与递归函数有关,North-Holland出版公司,阿姆斯特丹,1965]中的一个子系统。然后证明了实分析的一些命题,如海涅-波莱尔定理的一个版本,和逻辑的一些命题,如经典命题演算的紧性,在这个系统中等价于(弱)范定理。
This article presents a weak system of intuitionistic second-order arithmetic, WKV, a subsystem of the one in S.C. Kleene, R.E. Vesley [The Foundations of Intuitionistic Mathematics: Especially in Relation to Recursive Functions, North-Holland Publishing Company, Amsterdam, 1965]. It is then shown that some statements of real analysis, like a version of the Heine–Borel Theorem, and some statements of logic, e.g. compactness of classical proposition calculus, are equivalent to the (Weak) Fan Theorem in this system.