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arXiv 0706.0103cs.LOmath.LO
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算法归约的多概念和两种逻辑

Many concepts and two logics of algorithmic reduction

Giorgi Japaridze

摘要:

在为可计算性逻辑的各个部分寻找公理化的程序中,早先证明了交互式图灵归约逻辑正是海廷直觉主义演算的蕴涵片段。这种简化允许对前件所表示的计算资源进行无限的重用。然而,一种至少同样基本和自然的算法简化是不允许这种重用的。本文表明,把第一类归约的逻辑转变为第二类归约的逻辑,只需要从它的根岑式公理化中删除收缩规则。第一种(图灵)交互式约简也有三种自然版本。虽然这三个版本彼此非常不同,但它们的逻辑行为(孤立地)是无法区分的,而这种共同行为被隐含的直觉主义逻辑精确地捕获。在本文的其他贡献是一个非正式的介绍了一系列新的-有限和有界-版本的递归操作和相关的减少操作。有关可计算性逻辑的在线资源可在http://www.cis.upenn.edu/~giorgi/cl.html上找到

英文摘要:

Within the program of finding axiomatizations for various parts of computability logic, it was proved earlier that the logic of interactive Turing reduction is exactly the implicative fragment of Heyting's intuitionistic calculus. That sort of reduction permits unlimited reusage of the computational resource represented by the antecedent. An at least equally basic and natural sort of algorithmic reduction, however, is the one that does not allow such reusage. The present article shows that turning the logic of the first sort of reduction into the logic of the second sort of reduction takes nothing more than just deleting the contraction rule from its Gentzen-style axiomatization. The first (Turing) sort of interactive reduction is also shown to come in three natural versions. While those three versions are very different from each other, their logical behaviors (in isolation) turn out to be indistinguishable, with that common behavior being precisely captured by implicative intuitionistic logic. Among the other contributions of the present article is an informal introduction of a series of new -- finite and bounded -- versions of recurrence operations and the associated reduction operations. An online source on computability logic can be found at http://www.cis.upenn.edu/~giorgi/cl.html

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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