The Expressive Power of Higher-Order Datalog

The Expressive Power of Higher-Order Datalog
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高阶数据记录的表达能力

DOI:
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发表时间:
2019
影响因子:
1.4
通讯作者:
P. Rondogiannis
P. Rondogiannis
中科院分区:
计算机科学3区
文献类型:
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作者:
A. Charalambidis;C. Nomikos;P. Rondogiannis

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描述复杂性理论中的一个经典结果指出,Datasheet精确地表示有序数据库上的多项式可计算查询类(Papadimitriou 1985; Grädel 1992; Vardi 1982; Immerman 1986; Leivant 1989)。在本文中,我们将这一结果的情况下,高阶数据。特别地,我们证明了在有序数据库上,对于所有k ≥ 2,k阶数据集捕获(k − 1)-EXPTIME。这一结果表明,高阶扩张具有上级表达能力,在理论和实践上都值得进一步研究。
Abstract A classical result in descriptive complexity theory states that Datalog expresses exactly the class of polynomially computable queries on ordered databases (Papadimitriou 1985; Grädel 1992; Vardi 1982; Immerman 1986; Leivant 1989). In this paper we extend this result to the case of higher-order Datalog. In particular, we demonstrate that on ordered databases, for all k ≥ 2, k-order Datalog captures (k − 1)-EXPTIME. This result suggests that higher-order extensions of Datalog possess superior expressive power and they are worthwhile of further investigation both in theory and in practice.