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Hartmanis, J.; Mahaney, S.
SIAM journal on computing, 05/1981, Letnik: 10, Številka: 2Journal Article
In this paper we study languages accepted by nondeterministic $\log n$-tape automata that scan their input only once and relate their computational power to two-way $\log n$-tape automata. We show that for the one-way $\log n$-tape automata the nondeterministic model (1-NL) is computationally much more powerful than the deterministic model (1-L), that under one-way $\log n$-tape reductions there exist natural complete languages for these automata and that the complete languages cannot be sparse. Furthermore, we show that any language complete for nondeterministic one-way $\log n$-tape automata (under 1-L reductions) is also complete for the computationally more powerful nondeterministic two-way $\log n$-tape automata (NL) under two-way $\log n$-tape reductions. Therefore, for all bounds $T(n)$, $T(n) \geqq \log n$, the deterministic and nondeterministic $T(n)$-tape bounded computations collapse iff the nondeterministic one-way $\log n$-tape computations can be carried out by two-way deterministic log $n$-tape automata.
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in: SICRIS
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