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arXiv 1208.2631cs.LOmath.LO
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中间逻辑上的特征公式

Characteristic formulas over intermediate logics

Alex Citkin

摘要:

将特征公式的概念推广到无限可表示的亚直不可约代数。证明了Heyting代数簇的连续统中含有无限个可表示的次直不可约代数。此外,我们证明了存在一个连续的中间逻辑,可以公理化的特征公式的无限代数,而它们是不可公理化的标准Jankov公式。给出了不能用无限代数的特征公式公理化的中间逻辑的例子。同时,利用Goedel-McKinsey-Tarski变换,我们将这些结果推广到了S4的内部代数和正规扩张

英文摘要:

We expand the notion of characteristic formula to infinite finitely presentable subdirectly irreducible algebras. We prove that there is a continuum of varieties of Heyting algebras containing infinite finitely presentable subdirectly irreducible algebras. Moreover, we prove that there is a continuum of intermediate logics that can be axiomatized by characteristic formulas of infinite algebras while they are not axiomatizable by standard Jankov formulas. We give the examples of intermediate logics that are not axiomatizable by characteristic formulas of infinite algebras. Also, using the Goedel-McKinsey-Tarski translation we extend these results to the varieties of interior algebras and normal extensions of S4

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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