一句话:证明加入路径函数依赖与数据库后,带计数量词的守卫二变量片段的可满足性与有限可满足性均为 ExpTime 完全。
论文研究一阶逻辑中带计数量词的守卫二变量片段,并将其扩展以包含数据库与路径函数依赖。路径函数依赖可表达类似键约束的函数性依赖,可能影响该逻辑片段的判定行为。作者考察该扩展逻辑下可满足性与有限可满足性问题的计算复杂度,证明二者均为 ExpTime 完全。该结果界定了这一片段在数据库与知识表示场景中的推理代价,说明加入计数量词与路径函数依赖后,判定问题仍具有 ExpTime 完全复杂度。
The satisfiability and finite satisfiability problems for the two-variable guarded fragment of first-order logic with counting quantifiers, a database, and path-functional dependencies are both ExpTime-complete.
DOI 原文 · arXiv · PDF(开放获取) · DBLP
@article{KourtisP16,
title = {Adding Path-Functional Dependencies to the Guarded Two-Variable Fragment with Counting},
author = {Georgios Kourtis and Ian Pratt-Hartmann},
journal = {Logical Methods in Computer Science},
volume = {Volume 13, Issue 4},
year = {2017},
doi = {10.23638/lmcs-13(4:4)2017}
}