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On two-way multihead automata. (English) Zbl 0256.68028


MSC:

68Q45 Formal languages and automata
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References:

[1] Harrison, M. A.; Ibarra, O. H., Multi-tape and multi-head pushdown automata, Information and Control, 13, 433-470 (1968) · Zbl 0174.02701
[2] Ibarra, O. H., Characterizations of some tape and time complexity classes of Turing machines in terms of multihead and auxiliary stack automata, J. Comput. Systems Sci., 5, 88-117 (1971) · Zbl 0255.68012
[3] Ibarra, O. H., A note concerning nondeterministic tape complexities, J. Assoc. Comput. Mach., 19, 608-612 (1972) · Zbl 0245.94044
[4] Ruby, S.; Fischer, P. C., Translational methods and computational complexity, (IEEE Conference Record on Switching Circuit Theory and Logical Design. IEEE Conference Record on Switching Circuit Theory and Logical Design, Ann Arbor, Michigan (1965)), 173-178 · Zbl 0257.68037
[5] Cook, S. A., A hierarchy for nondeterministic time complexity, (Conference Record of ACM Symposium on Theory of Computing. Conference Record of ACM Symposium on Theory of Computing, Denver, Colorado (1972)), 187-192 · Zbl 0361.68074
[6] Aho, A. V.; Hopcroft, J. E.; Ullman, J. D., Time and tape complexity of pushdown automaton languages, Information and Control, 13, 186-206 (1968) · Zbl 0257.68065
[7] Cook, S. A., Characterizations of pushdown machines in terms of time-bounded computers, J. Assoc. Comput. Mach., 18, 4-18 (1971) · Zbl 0222.02035
[8] Hennie, F. C.; Stearns, R. E., Two-tape simulation of multitape Turing machines, J. Assoc. Comput. Mach., 13, 533-546 (1966) · Zbl 0148.24801
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