# A Sound and Complete Axiomatic System for Modality $\Box\phi\equiv\Box_1\phi\land\Box_2\phi$

Abstract : An axiomatic system is presented in this paper, which has a modal operator □ such that $\Box\phi\equiv\Box_1\phi\land\Box_2\phi$, where □1 and □2 are the modal operators of the language for the axiom system S5. The axiomatic system for □ is proved to be sound and complete.
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Shaobo Deng, Meiying Sun, Cungen Cao, yuefei Sui. A Sound and Complete Axiomatic System for Modality $\Box\phi\equiv\Box_1\phi\land\Box_2\phi$. 8th International Conference on Intelligent Information Processing (IIP), Oct 2014, Hangzhou, China. pp.152-160, ⟨10.1007/978-3-662-44980-6_17⟩. ⟨hal-01383328⟩

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