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IEICE TRANSACTIONS on Fundamentals

Some Observations on One-way Alternating Pushdown Automata with Sublinear Space

Jianliang XU, Tsunehiro YOSHINAGA, Katsushi INOUE

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Summary :

This paper investigates some fundamental properties of one-way alternating pushdown automata with sublinear space. We first show that one-way nondeterministic pushdown automata are incomparale with one-way alternating pushdown automata with only universal states, for spaces between log log n and log n, and also for spaces between log n and n/log n. We then show that there exists an infinite space hierarchy among one-way alternating pushdown automata with only universal states which have sublinear space.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E87-A No.5 pp.1012-1019
Publication Date
2004/05/01
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Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
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