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Yu. L. Ershov, E. A. Palyutin, and M. A. Taitslin, Mathematical Logic [in Russian], Novosibirsk State Univ., Novosibirsk (1973).
A. H. Lachlan, "On the lattice of resursively enumerable sets," Trans. Am. Math. Soc.,130, No. 1, 1–37 (1968).
Translated from Algebra i Logika, Vol. 17, No. 2, pp. 134–143, March–April, 1978.
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Degtev, A.N. Solvability of the∀∃-theory of a certain factor-lattice of recursively enumerable sets. Algebra and Logic 17, 94–101 (1978). https://doi.org/10.1007/BF01670108
- Mathematical Logic