## Abstract

Properties of (unbounded-error) probabilistic as well as "probabilistic plus nondeterministic" pushdown automata and auxiliary pushdown automata are studied. These models are analogous to their counterparts with nondeterministic and alternating states. Complete characterizations in terms of well-known complexity classes are given for the classes of languages recognized by polynomial time-bounded, logarithmic space-bounded auxiliary pushdown automata with probabilistic states and with "probabilistic plus nondeterministic" states. Also, complexity lower bounds are given for the classes of languages recognized by these automata with unlimited running time. It follows that, by fixing an appropriate mode of computation, the difference between classes of languages such as P and PSPACE, NL and SAC1, PL and Diff_{>}(#SAC^{1}) is characterized as the difference between the number of stack symbols; that is, whether the stack alphabet contains one versus two distinct symbols.

Original language | English (US) |
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Pages (from-to) | 117-130 |

Number of pages | 14 |

Journal | Theoretical Computer Science |

Volume | 207 |

Issue number | 1 |

DOIs | |

State | Published - Oct 28 1998 |

Externally published | Yes |

## Keywords

- Arthur-Merlin games
- Games against nature
- Models of computation
- Probabilistic computation
- Pushdown automata
- Space-bounded computation

## ASJC Scopus subject areas

- Theoretical Computer Science
- Computer Science(all)