Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Research › peer-review
Descriptional complexity of unambiguous nested word automata. / Okhotin, Alexander; Salomaa, Kai.
Language and Automata Theory and Applications - 5th International Conference, LATA 2011, Proceedings. 2011. p. 414-426 (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 6638 LNCS).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Research › peer-review
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TY - GEN
T1 - Descriptional complexity of unambiguous nested word automata
AU - Okhotin, Alexander
AU - Salomaa, Kai
PY - 2011/6/8
Y1 - 2011/6/8
N2 - It is known that converting an n-state nondeterministic nested word automaton (a.k.a. input-driven automaton; a.k.a. visibly pushdown automaton) to a corresponding deterministic automaton requires in the worst case 2 Θ(n2) states (R. Alur, P. Madhusudan: Adding nesting structure to words, DLT'06). We show that the same worst case 2Θ(n2) size blow-up occurs when converting a nondeterministic nested word automaton to an unambiguous one, and an unambiguous nested word automaton to a deterministic one. In addition, the methods developed in this paper are used to demonstrate that the state complexity of complementation for nondeterministic nested word automata is 2Θ(n2), and that the state complexity of homomorphism for deterministic nested word automata is 2Θ(n2).
AB - It is known that converting an n-state nondeterministic nested word automaton (a.k.a. input-driven automaton; a.k.a. visibly pushdown automaton) to a corresponding deterministic automaton requires in the worst case 2 Θ(n2) states (R. Alur, P. Madhusudan: Adding nesting structure to words, DLT'06). We show that the same worst case 2Θ(n2) size blow-up occurs when converting a nondeterministic nested word automaton to an unambiguous one, and an unambiguous nested word automaton to a deterministic one. In addition, the methods developed in this paper are used to demonstrate that the state complexity of complementation for nondeterministic nested word automata is 2Θ(n2), and that the state complexity of homomorphism for deterministic nested word automata is 2Θ(n2).
UR - http://www.scopus.com/inward/record.url?scp=79957946511&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-21254-3-33
DO - 10.1007/978-3-642-21254-3-33
M3 - Conference contribution
AN - SCOPUS:79957946511
SN - 9783642212536
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 414
EP - 426
BT - Language and Automata Theory and Applications - 5th International Conference, LATA 2011, Proceedings
T2 - 5th International Conference on Language and Automata Theory and Applications, LATA2011
Y2 - 26 May 2011 through 31 May 2011
ER -
ID: 41142776