## Test sets and checking words for homomorphism equivalence.(English)Zbl 0451.68046

### MSC:

 68Q45 Formal languages and automata

### Keywords:

homomorphism equivalence; Ehrenfeucht’s conjecture
Full Text:

### References:

 [1] Culik, K., A purely homomorphic characterization of recursively enumerable sets, J. assoc. comput. Mach., 26, 345-350, (1979) · Zbl 0395.68076 [2] Culik, K.; Fris, I., The decidability of the equivalence problem for DOL-systems, Inform. contr., 35, 20-39, (1977) · Zbl 0365.68074 [3] Culik, K.; Maurer, H.A., On simple representation of language families, R.a.i.r.o., 13, 241-250, (1979) · Zbl 0432.68052 [4] Culik, K.; Richier, J.L., Homomorphism equivalence on ETOL languages, Internat. J. computer math., sect. A, 7, 43-51, (1979) · Zbl 0401.68049 [5] Culik, K.; Salomaa, A., On the decidability of homomorphism equivalence for languages, J. comput. system sci., 17, 163-175, (1978) · Zbl 0389.68042 [6] Ehrenfeucht, A.; Rozenberg, G., Elementary homomorphisms and a solution of the DOL sequence equivalence problem, Theoret. comput. sci., 7, 169-183, (1978) · Zbl 0407.68085 [7] Harrison, M.A., Introduction to formal languages, (1978), Addison-Wesley Reading, Mass [8] Rozenberg, G.; Salomaa, A., The mathematical theory of L systems, (1980), Academic Press New York/London · Zbl 0365.68072 [9] Salomaa, A., Formal languages, (1973), Academic Press New York/London · Zbl 0262.68025
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