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Language equivalence of probabilistic pushdown automata.
Autoři | |
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Rok publikování | 2014 |
Druh | Článek v odborném periodiku |
Časopis / Zdroj | Information and computation |
Fakulta / Pracoviště MU | |
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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