Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4950911 | Information Processing Letters | 2017 | 4 Pages |
Abstract
â¢Tree Automata with constraints are a relevant for modeling programs, protocols and XML-like documents.â¢The Emptiness problem for TAGâ§ is decidable but the only known algorithm is non elementary.â¢Studying the complexity of sub-classes of TAGâ§ is therefore a challenging problem.â¢We prove that the emptiness problem for TAGâ§ with at least one disequality constraint is NP-hard.
The model of tree automata with global equality and disequality constraints was introduced in 2007 by Filiot, Talbot and Tison, and extended in various ways since then. In this paper we show that if there is at least one disequality constraint, the emptiness problem is NP-hard.
Related Topics
Physical Sciences and Engineering
Computer Science
Computational Theory and Mathematics
Authors
P.-C. Héam, V. Hugot, O. Kouchnarenko,