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A helpful result for proving inherent ambiguity. (English) Zbl 0175.27802

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[1] Y. Bar-Hillel, M. Perles andE. Shamir, On formal properties of simple phrase structure grammars.Z. Phonetik Sprachwiss. Kommunikat. 14 (1961), 143–172. · Zbl 0106.34501
[2] N. Chomsky, Formal properties of grammars.Handbook of Mathematical Psychology, Vol. 2 (edited by R. D. Luce, R. Bush, and E. Galanter), John Wiley and Sons, Inc., New York, 1963. · Zbl 0156.25303
[3] S. Ginsburg,The Mathematical Theory of Context-Free Languages. McGraw-Hill Book Company, New York, 1966. · Zbl 0184.28401
[4] S. Ginsburg andJ. S. Ullian, Ambiguity in context-free languages.J. Assoc. Comput. Mach. 13 (1966), 62–89. · Zbl 0139.12207
[5] R. J. Parikh, Language generating devices.MIT Res. Lab. Electron. Quart. Prog. Rep. 60 (1961), 199–212.
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