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arXiv 1908.01661math.LO
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矩阵语义学中的真值谓词研究

A study of truth predicates in matrix semantics

T. Moraschini

摘要:

抽象代数逻辑是为任意命题逻辑的代数研究提供通用工具的理论。根据这一理论,每个逻辑L都与一个矩阵语义Mod*(L)相关联。本文是对Mod*(L)中矩阵的所谓“真值集”的系统研究的一个贡献。特别是,我们表明,Mod*(L)的真值集可以通过具有普遍量化参数的方程来定义,这一事实被限制于L的演绎滤波器的莱布尼茨算子的序理论性质所捕获。这一结果是以前已知的方程可定义性没有参数。类似地,已知Mod*(L)的真值集是隐式可定义的当且仅当莱布尼茨算子在每个代数上的L的演绎滤子上是单射的。然而,Leibniz算子的内射性是否从L的理论转移到任意代数上的演绎滤子上,这是一个悬而未决的问题。我们表明,这是一个可数的语言表示的逻辑的情况下,它不一定是真的一般。最后,我们考虑了Mod*(L)中真值集的一个中间条件,它对应于Leibniz算子的序反射。

英文摘要:

Abstract algebraic logic is a theory that provides general tools for the algebraic study of arbitrary propositional logics. According to this theory, every logic L is associated with a matrix semantics Mod*(L). This paper is a contribution to the systematic study of the so-called "truth sets" of the matrices in Mod*(L). In particular, we show that the fact that the truth sets of Mod*(L) can be defined by means of equations with universally quantified parameters is captured by an order-theoretic property of the Leibniz operator restricted to deductive filters of L. This result was previously known for equational definability without parameters. Similarly, it was known that the truth sets of Mod*(L) are implicitly definable if and only if the Leibniz operator is injective on deductive filters of L over every algebra. However, it was an open problem whether the injectivity of the Leibniz operator transfers from the theories of L to its deductive filters over arbitrary algebras. We show that this is the case for logics expressed in a countable language, and that it need not be true in general. Finally we consider an intermediate condition on the truth sets in Mod*(L) that corresponds to the order-reflection of the Leibniz 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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