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arXiv 1804.09810math.LO
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关于模型论关系的模态逻辑

On modal logics of model-theoretic relations

Denis I. Saveliev, Ilya B. Shapirovsky

摘要:

给定一个模型类$\mathcal C$,模型之间的二元关系${\mathcal R}$,以及模型理论语言$L$,我们考虑$L$中的$\mathcal C$理论的模态逻辑和模态代数,其中模态算子通过$\mathcal R$来解释.我们讨论了$\mathcal C$和${\mathcal R}$的模态理论如何依赖于模型理论语言、它们的Kripke完备性和$L$内部模态的可表达性。我们计算这样的理论的子模型和商数关系。我们证明了一个向下的Löwenheim-Skolem定理的一阶语言扩展的模态算子之间的扩展关系的模型。

英文摘要:

Given a class $\mathcal C$ of models, a binary relation ${\mathcal R}$ between models, and a model-theoretic language $L$, we consider the modal logic and the modal algebra of the theory of $\mathcal C$ in $L$ where the modal operator is interpreted via $\mathcal R$. We discuss how modal theories of $\mathcal C$ and ${\mathcal R}$ depend on the model-theoretic language, their Kripke completeness, and expressibility of the modality inside $L$. We calculate such theories for the submodel and the quotient relations. We prove a downward Löwenheim--Skolem theorem for first-order language expanded with the modal operator for the extension relation between models.

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