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arXiv 2107.05069math.LO
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关于方程完备性定理

On equational completeness theorems

T. Moraschini

摘要:

当一个逻辑可以被解释为与某类代数相关的等式推论时,它被称为承认一个等式完备性定理。我们刻画逻辑承认一个方程完备性定理,要么是局部表格或有一些重言式。特别地,当一个原代数逻辑有两个不同的逻辑等值公式时,它精确地承认一个方程完备性定理。虽然问题的确定是否承认一个逻辑方程的完备性定理被证明是可判定的逻辑由一个有限集的有限矩阵和局部表逻辑提出的有限希尔伯特演算,它成为不可判定的任意逻辑提出的有限希尔伯特演算。

英文摘要:

A logic is said to admit an equational completeness theorem when it can be interpreted into the equational consequence relative to some class of algebras. We characterize logics admitting an equational completeness theorem that are either locally tabular or have some tautology. In particular, it is shown that a protoalgebraic logic admits an equational completeness theorem precisely when its has two distinct logically equivalent formulas. While the problem of determining whether a logic admits an equational completeness theorem is shown to be decidable both for logics presented by a finite set of finite matrices and for locally tabular logics presented by a finite Hilbert calculus, it becomes undecidable for arbitrary logics presented by finite Hilbert calculi.

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