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arXiv 0903.2448cs.LOcs.MA
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伴随模态的正逻辑:证明理论、语义学与信息推理

Positive Logic with Adjoint Modalities: Proof Theory, Semantics and Reasoning about Information

Mehrnoosh Sadrzadeh, Roy Dyckhoff

摘要:

我们考虑一个简单的模态逻辑,其非模态部分有合取和析取作为连接词,其模态是伴随对,但不是一般的闭包算子。尽管没有否定和蕴涵,也没有与(例如)的特征公理相对应的公理,T,S4和S5,这样的逻辑是有用的,如Baltag,Coecke和第一作者在以前的工作中所示,用于编码和推理多智能体系统中的信息和错误信息。对于这样一个逻辑,我们提出了一个代数语义,使用格与代理索引的家庭的伴随对运营商,和一个免费的切演算。演算利用操作符的序列,在风格的“嵌套”或“树”演算;切容许性是由建设性的句法方法。逻辑的适用性说明了推理的泥泞的儿童难题,其中演算增加了额外的规则来表达事实的泥泞的儿童场景。

英文摘要:

We consider a simple modal logic whose non-modal part has conjunction and disjunction as connectives and whose modalities come in adjoint pairs, but are not in general closure operators. Despite absence of negation and implication, and of axioms corresponding to the characteristic axioms of (e.g.) T, S4 and S5, such logics are useful, as shown in previous work by Baltag, Coecke and the first author, for encoding and reasoning about information and misinformation in multi-agent systems. For such a logic we present an algebraic semantics, using lattices with agent-indexed families of adjoint pairs of operators, and a cut-free sequent calculus. The calculus exploits operators on sequents, in the style of "nested" or "tree-sequent" calculi; cut-admissibility is shown by constructive syntactic methods. The applicability of the logic is illustrated by reasoning about the muddy children puzzle, for which the calculus is augmented with extra rules to express the facts of the muddy children scenario.

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