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No recursively enumerable set is the union of finitely many immune retraceable sets. (English) Zbl 0183.01402
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[1] K. I. Appel and T. G. McLaughlin, On properties of regressive sets, Trans. Amer. Math. Soc. 115 (1965), 83 – 93. · Zbl 0192.05202
[2] J. C. E. Dekker and J. Myhill, Retraceable sets, Canad. J. Math. 10 (1958), 357 – 373. · Zbl 0082.01505 · doi:10.4153/CJM-1958-035-x · doi.org
[3] T. G. McLaughlin, Splitting and decomposition by regressive sets. II, Canad. J. Math. 19 (1967), 291 – 311. · Zbl 0221.02025 · doi:10.4153/CJM-1967-021-3 · doi.org
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