A Step Up in Expressiveness of Decidable Fixpoint Logics
A Step Up in Expressiveness of Decidable Fixpoint Logics
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可判定定点逻辑的表达能力得到提升
DOI:
10.1145/2933575.2933592
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Benedikt M
中科院分区:
文献类型:
--
作者:
Benedikt M
Guardedness restrictions are one of the principal means to obtain decidable logics — operators such as negation are restricted so that the free variables are contained in an atom. While guardedness has been applied fruitfully in the setting of first-order logic, the ability to add fixpoints while retaining decidability has been very limited. Here we show that one of the main restrictions imposed in the past can be lifted, getting a richer decidable logic by allowing fixpoints in which the parameters of the fixpoint can be unguarded. Using automata, we show that the resulting logics have a decidable satisfiability problem, and provide a fine study of the complexity of satisfiability. We show that similar methods apply to decide questions concerning the elimination of fixpoints within formulas of the logic.
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DOI:
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期刊:
Journal of Symbolic Logic (JSL)
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DOI:
10.4171/automata-1/8
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2010 25th Annual IEEE Symposium on Logic in Computer Science
影响因子:
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通讯作者:
Christof Löding
DOI:
10.2168/lmcs-10(3:2)2014
发表时间:
2011
期刊:
Log. Methods Comput. Sci.
影响因子:
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