We give sufficient conditions for generalized computable numberings to satisfy the statement of Khutoretskii’s theorem. This implies limitedness of universal \( {\varSigma}_{\alpha}^0- \) computable numberings for 2 \( \le \alpha <{\omega}_1^{CK}. \)
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References
A. B. Khutoretskii, “On the cardinality of the upper semilattice of computable enumerations,” Algebra and Logic, 10, No. 5, 348-352 (1971).
S. S. Goncharov and A. Sorbi, “Generalized computable numerations and nontrivial Rogers semilattices,” Algebra and Logic, 36, No. 6, 359-369 (1997).
S. A. Badaev and S. S. Goncharov, “Generalized computable universal numberings,” Algebra and Logic, 53, No. 5, 355-364 (2014).
S. A. Badaev and S. Yu. Podzorov, “Minimal coverings in the Rogers semilattices of \( {\varSigma}_n^0- \) computable numberings,” Sib. Math. J., 43, No. 4, 616-622 (2002).
S. Yu. Podzorov, “The limit property of the greatest element in the Rogers semilattice,” Math. Trudy, 7, No. 2, 98-108 (2004).
S. A. Badaev, S. S. Goncharov, and A. Sorbi, “Completeness and universality of arithmetical numberings,” in Computability and Models, S. B. Cooper and S. S. Goncharov (eds.), Kluwer Academic/Plenum Publishers, New York (2003), pp. 11-44.
M. Kh. Faizrakhmanov, “The Rogers semilattices of generalized computable enumerations,” Sib. Math. J., 58, No. 6, 1104-1110 (2017).
M. Kh. Faizrakhmanov, “Universal generalized computable numberings and hyperimmunity,” Algebra and Logic, 56, No. 4, 337-347 (2017).
Yu. L. Ershov, Theory of Numerations [in Russian], Nauka, Moscow (1977).
R. I. Soare, Recursively Enumerable Sets and Degrees, Perspect. Math. Log., Omega Ser., Springer-Verlag, Heidelberg (1987).
P. G. Odifreddi, Classical Recursion Theory. The Theory of Functions and Sets of Natural Numbers, Stud. Log. Found. Math., 125, North-Holland, Amsterdam (1989).
C. G. Jockusch, Jr., “Degrees in which the recursive sets are uniformly recursive,” Can. J. Math., 24, 1092-1099 (1972).
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The work was carried out at the expense of the subsidy allocated to Kazan (Volga Region) Federal University for the fulfillment of the state task in the sphere of scientific activity, project No. 1.1515.2017/4.6.
Translated from Algebra i Logika, Vol. 58, No. 4, pp. 528-541, July-August, 2019.
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Faizrakhmanov, M.K. Khutoretskii’s Theorem for Generalized Computable Families. Algebra Logic 58, 356–365 (2019). https://doi.org/10.1007/s10469-019-09557-9
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DOI: https://doi.org/10.1007/s10469-019-09557-9