Literature Cited
Yu. L. Ershov and I. A. Lavrov, "The upper semilattice L ((γ))," Algebra i Logika,12, No. 2, 167–189 (1973).
A. H. Lachlan, "Two theorems on many-one degrees of recursively enumerable sets," Algebra i Logika,11, No. 2, 216–229 (1972).
A. H. Lachlan, "Recursively enumerable many-one degrees," Algebra i Logika,11, No. 3, 326–358 (1972).
Additional information
Translated from Algebra i Logika, Vol. 13, No. 6, pp. 635–654, November–December, 1974.
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V'yugin, V.V. Segments of recursively enumerablem-degrees. Algebra and Logic 13, 361–373 (1974). https://doi.org/10.1007/BF01462947
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DOI: https://doi.org/10.1007/BF01462947