WQO is decidable for factorial languages

被引:2
|
作者
Atminas, Aistis [1 ]
Lozin, Vadim [2 ]
Moshkov, Mikhail [3 ]
机构
[1] London Sch Econ, Dept Math, Houghton St, London WC2A 2AE, England
[2] Univ Warwick, Math Inst, Coventry CV4 7AL, W Midlands, England
[3] KAUST, CEMSE Div, Thuwal 239556900, Saudi Arabia
基金
英国工程与自然科学研究理事会;
关键词
Well-quasi-ordering; Factorial language; Polynomial-time algorithm; Induced subgraph; Permutation; INDUCED SUBGRAPHS; QUASI-ORDERS; WELL; PERMUTATIONS; ANTICHAINS;
D O I
10.1016/j.ic.2017.08.001
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
A language is factorial if it is closed under taking factors, i.e. contiguous subwords. Every factorial language can be described by an antidictionary, i.e. a minimal set of forbidden factors. We show that the problem of deciding whether a factorial language given by a finite antidictionary is well-quasi-ordered under the factor containment relation can be solved in polynomial time. We also discuss possible ways to extend our solution to permutations and graphs. (C) 2017 Elsevier Inc. All rights reserved.
引用
收藏
页码:321 / 333
页数:13
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