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arXiv 1306.2068cs.LOmath.LO
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经典命题逻辑和直觉命题逻辑的模态逻辑混合

A modal logic amalgam of classical and intuitionistic propositional logic

Steffen Lewitzka

摘要:

由哥德尔在1932年提出并由麦肯锡和塔斯基在1948年证明的一个著名的结果是:$φ$是直觉命题逻辑IPC的一个定理当且仅当它的哥德尔翻译$φ'$是模态逻辑S4的一个定理。在本文中,我们扩展了在我们的前一篇文章(S. Lewitzka,Algebraic Semantics for a Modal Logic Close to S1,J. Logic and Comp.,doi:10.1093/logcom/exu 067),并证明了:命题公式$φ$是IPC的一个定理当且仅当$\squareφ$是L的一个定理(实际上,我们证明了:$Φ\vdash_{IPC}φ$当且仅当$\squareΦ\vdash_L\squareφ$,对于命题$Φ,φ$).因此,映射$φ\mapsto\squareφ$是IPC到L中的嵌入,即L包含IPC的副本。此外,L是经典命题逻辑CPC的保守扩展。在这个意义上,L是CPC和IPC的混合物。证明了L是完备的。一类具有(非正规)模态算子的特殊Heyting代数。

英文摘要:

A famous result, conjectured by Gödel in 1932 and proved by McKinsey and Tarski in 1948, says that $φ$ is a theorem of intuitionistic propositional logic IPC iff its Gödel-translation $φ'$ is a theorem of modal logic S4. In this paper, we extend an intuitionistic version of modal logic S1+SP, introduced in our previous paper (S. Lewitzka, Algebraic semantics for a modal logic close to S1, J. Logic and Comp., doi:10.1093/logcom/exu067) to a classical modal logic L and prove the following: a propositional formula $φ$ is a theorem of IPC iff $\squareφ$ is a theorem of L (actually, we show: $Φ\vdash_{IPC}φ$ iff $\squareΦ\vdash_L\squareφ$, for propositional $Φ,φ$). Thus, the map $φ\mapsto\squareφ$ is an embedding of IPC into L, i.e. L contains a copy of IPC. Moreover, L is a conservative extension of classical propositional logic CPC. In this sense, L is an amalgam of CPC and IPC. We show that L is sound and complete w.r.t. a class of special Heyting algebras with a (non-normal) modal operator.

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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