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A note on undecidable properties of formal languages. (English) Zbl 0157.01902


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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
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[10] S. Rabin andD. Scott, Finite automata and their decision problems.IBM J. Res. Develop. 3 (1959), 114–125. · Zbl 0158.25404 · doi:10.1147/rd.32.0114
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