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Language equivalence of probabilistic pushdown automata.

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FOREJT Vojtěch JANČAR Petr KIEFER Stefan WORRELL James

Rok publikování 2014
Druh Článek v odborném periodiku
Časopis / Zdroj Information and computation
Fakulta / Pracoviště MU

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Citace
Doi http://dx.doi.org/10.1016/j.ic.2014.04.003
Obor Informatika
Klíčová slova Pushdown systems; Language equivalence; Probabilistic systems
Popis We study the language equivalence problem for probabilistic pushdown automata (pPDA) and their subclasses. We show that the problem is interreducible with the multiplicity equivalence problem for context-free grammars, the decidability of which has been open for several decades. Interreducibility also holds for pPDA with one control state. In contrast, for the case of a one-letter input alphabet we show that pPDA language equivalence (and hence multiplicity equivalence of context-free grammars) is in PSPACE and at least as hard as the polynomial identity testing problem.
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