Conference paper

 
Abdulla, P., A., Bouajjani, A., Holík, L., Kaati, L., Vojnar, T.: Computing Simulations over Tree Automata (Efficient Techniques for Reducing Tree Automata), In: Tools and Algorithms for the Construction and Analysis of Systems, Berlin, DE, Springer, 2008, p. 93-108, ISBN 978-3-540-78799-0
Publication language:english
Original title:Computing Simulations over Tree Automata (Efficient Techniques for Reducing Tree Automata)
Title (cs):Výpočet simulací nad stromovými automaty (Efektivní techniky pro redukci stromových automatů)
Pages:93-108
Proceedings:Tools and Algorithms for the Construction and Analysis of Systems
Conference:European Joint Conferences on Theory and Practice of Software -- ETAPS'08 (TACAS'08, FoSSaCS'08)
Series:LNCS 4963
Place:Berlin, DE
Year:2008
ISBN:978-3-540-78799-0
Publisher:Springer Verlag
Keywords
tree automata, simulation relation, nondeterministic tree automata, reductionm, language preservation
Annotation
We address the problem of computing simulation relations over tree automata. In particular, we consider downward and upward simulations on tree automata, which are, loosely speaking, analogous to forward and backward relations over word automata. We provide simple and efficient algorithms for computing these relations based on a reduction to the problem of computing simulations on labelled transition systems. Furthermore, we show that downward and upward relations can be combined to get relations compatible with the tree language equivalence, which can subsequently be used for an efficient size reduction of nondeterministic tree automata. This is of a very high interest, for instance, for symbolic verification methods such as regular model checking, which use tree automata to represent infinite sets of reachable configurations. We provide experimental results showing the efficiency of our algorithms on examples of tree automata taken from regular model checking computations.
BibTeX:
@INPROCEEDINGS{
   author = {A. Parosh Abdulla and Ahmed Bouajjani and Lukáš Holík and
	Lisa Kaati and Tomáš Vojnar},
   title = {Computing Simulations over Tree Automata (Efficient
	Techniques for Reducing Tree Automata)},
   pages = {93--108},
   booktitle = {Tools and Algorithms for the Construction and Analysis of
	Systems},
   series = {LNCS 4963},
   year = {2008},
   location = {Berlin, DE},
   publisher = {Springer Verlag},
   ISBN = {978-3-540-78799-0},
   language = {english},
   url = {http://www.fit.vutbr.cz/research/view_pub.php?id=8575}
}