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A note on finite-valued and finitely ambiguous transducers. (English) Zbl 0502.68022

##### MSC:
 68Q45 Formal languages and automata
Full Text:
##### References:
 [1] Blattner, M., and Head, T. The decidability of equivalence for deterministic finite transducers,Journal of Computer and System Sciences 19 (1979), 45–49. · Zbl 0416.68073 [2] Blattner, M., and Head, T. Single-valueda-transducers,Journal of Computer and System Sciences 15 (1977), 310–327. · Zbl 0367.94071 [3] Chan, T. and Ibarra, O. On the finite-valuedness problem for sequential machines, to appear inTheoretical Computer Science. · Zbl 0503.68037 [4] Friedman, E., and Greibach, S. A polynomial time algorithm for deciding the equivalence problem for 2-tape deterministic finite state acceptors,SIAM Journal on Computing 11, 166–183 (1982). · Zbl 0497.68050 [5] Garey, M., and Johnson, D. ”Computers and Intractability: A Guide to the Theory of NP-Completeness,” H. Freeman, San Francisco, 1978. · Zbl 0411.68039 [6] Griffiths, T. The unsolvability of the equivalence problem for {$$\epsilon$$}-free nondeterministic generalized machines,Journal of the Association for Computing Machinery, 15, 409–413 (1968). · Zbl 0162.02302 [7] Gurari, E. Transducers with decidable equivalence problem, TR-CS-79–4, University of Wiscon-sin-Milwaukee (1979). Revised, TR-CS-81-182 SUNY, at Buffalo (1981). [8] Gurari, E. The equivalence problem for deterministic two-way sequential transducers is decidable,Proceedings of the 21st Symposium on Foundations of Computer Science (1980), 83–85. [9] Gurari, E., and Ibarra, O. The complexity of decision problems for finite-turn multicounter machines,Journal of Computer and System Sciences 22 (1981), 220–229. · Zbl 0458.68011 [10] Hopcroft, J., and Ullman, J. ”Introduction to Automata Theory, Languages, and Computation,” Addison-Wesley, Reading, MA, 1979. · Zbl 0426.68001 [11] Ibarra, O. The unsolvability of the equivalence problem for {$$\epsilon$$}-free NGSM’s with unary input (output) alphabet and applications,SIAM Journal on Computing 4 (1978), 524–532. · Zbl 0386.68054 [12] Stearns, R., and Hunt III, H. On the equivalence and containment problems for unambiguous regular expressions, grammars, and automata,Proceedings of the 22nd Annual Symposium on Foundations of Computer Science (1981), 74–81. · Zbl 0577.68074
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