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Tree correspondence problems. (English) Zbl 0478.68089


MSC:

68T99 Artificial intelligence
68R10 Graph theory (including graph drawing) in computer science
03D35 Undecidability and degrees of sets of sentences
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References:

[1] Aho, A.V.; Ullman, J.D., ()
[2] Harrison, M.A., Introduction to formal languages, (1978), Addison-Wesley Reading, Mass
[3] Knuth, D.E., ()
[4] Knuth, D.E., A characterization of parenthesis languages, Inform. contr., 11, 269-289, (1968) · Zbl 0196.01703
[5] McNaughton, R., Parenthesis grammars, J. assoc. comput. Mach., 14, 490-500, (1967) · Zbl 0168.01206
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