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Checking sets, test sets, rich languages and commutatively closed languages. (English) Zbl 0507.68049


MSC:

68Q45 Formal languages and automata
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[1] Albert, J.; Culik, K.; Karhumäki, J., Test sets for context-free languages and algebraic systems of equations over a free monoid, () · Zbl 0477.68082
[2] Book, R.V.; Brandenburg, F.-J., Equality sets and complexity classes, SIAM J. comput., 9, 729-743, (1980) · Zbl 0446.68040
[3] Culik, K., Some decidability results about regular and pushdown translations, Inform. process. lett., 8, 5-8, (1979) · Zbl 0397.68083
[4] Culik, K., Homomorphisms: decidability, equality, and test sets, (), 167-194
[5] Culik, K.; Diamond, N.D., A homomorphic characterization of time and space complexity classes of languages, Internat. J. comput. math., 8A, 207-222, (1980) · Zbl 0444.68035
[6] Culik, K.; Karhumaki, J., Systems of equations over a free monoid and Ehrenfeucht conjecture, Discrete math., (1982), to appear
[7] Culik, K.; Salomaa, A., On the decidability of homomorphism equivalence for languages, J. comput. system sci., 17, 163-175, (1978) · Zbl 0389.68042
[8] Culik, K.; Salomaa, A., Test sets and checking words for homomorphism equivalence, J. comput. system sci., 20, 379-395, (1980) · Zbl 0451.68046
[9] Ehrenfeucht, A.; Rozenberg, G., Elementary homomorphisms and a solution to the DOL sequence equivalence problem, Theoret. comput. sci., 7, 169-183, (1978) · Zbl 0407.68085
[10] Ginsburg, S., Algebraic and automata-theoretic properties of formal languages, (1975), NorthHolland Amsterdam · Zbl 0325.68002
[11] Harrison, M.A., Introduction to formal language theory, (1978), Addison-Wesley Reading, Mass · Zbl 0411.68058
[12] Hopcroft, J.E.; Ullman, J.D., Formal languages and their relation to automata, (1980), Addison-Wesley Reading, Mass · Zbl 0196.01701
[13] Makanin, G.S., The problem of solvability of equations in a free semigroup, Mat. sb., 103, 145, 148-236, (1977), [Russian] · Zbl 0371.20047
[14] Salomaa, A., Formal languages, (1973), Academic Press New York · Zbl 0262.68025
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