arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.2154cs.LOcs.AIcs.CCmath.LO
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从公式到可计算性逻辑中的电路

From formulas to cirquents in computability logic

Shandong University(山东大学);Villanova University(维拉诺瓦大学)

Giorgi Japaridze

摘要:

可计算性逻辑(Computability Logic,CoL)(参见http://www.cis.upenn.edu/cnigiorgi/cl.html)是一个最近引入的语义平台和雄心勃勃的计划,用于将逻辑重新发展为可计算性的形式理论,而不是逻辑传统上的形式真值理论。它的表达式代表了交互式计算任务,被视为机器与环境的游戏,而“真理”被理解为算法获胜策略的存在。CoL的形式主义是开放式的,并且已经经历了一系列的扩展,其中逻辑运算符代表了对游戏的操作。本文以一种全新的方式扩展了CoL的表达能力,将公式(CoL的早期语言仅限于此)推广到称为cirquents的电路式结构。与公式不同,后者能够解释整个游戏/任务的不同部分之间的子游戏/子任务共享。这种能力所提供的许多优点之一是,它允许我们捕获、提炼和概括众所周知的独立友好逻辑,在目前的飞跃之后,它自然成为CoL的保守片段,就像经典逻辑被认为是CoL的基于公式的版本的保守片段一样。并且可以在不熟悉CoL的情况下阅读。

英文摘要:

Computability logic (CoL) (see http://www.cis.upenn.edu/~giorgi/cl.html) is a recently introduced semantical platform and ambitious program for redeveloping logic as a formal theory of computability, as opposed to the formal theory of truth that logic has more traditionally been. Its expressions represent interactive computational tasks seen as games played by a machine against the environment, and "truth" is understood as existence of an algorithmic winning strategy. With logical operators standing for operations on games, the formalism of CoL is open-ended, and has already undergone series of extensions. This article extends the expressive power of CoL in a qualitatively new way, generalizing formulas (to which the earlier languages of CoL were limited) to circuit-style structures termed cirquents. The latter, unlike formulas, are able to account for subgame/subtask sharing between different parts of the overall game/task. Among the many advantages offered by this ability is that it allows us to capture, refine and generalize the well known independence-friendly logic which, after the present leap forward, naturally becomes a conservative fragment of CoL, just as classical logic had been known to be a conservative fragment of the formula-based version of CoL. Technically, this paper is self-contained, and can be read without any prior familiarity with CoL.

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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