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A Σ-Set of Natural Numbers Not Enumerable by Natural Numbers

✍ Scribed by A. S. Morozov

Book ID
119651211
Publisher
SP MAIK Nauka/Interperiodica
Year
2000
Tongue
English
Weight
144 KB
Volume
41
Category
Article
ISSN
0037-4466

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We construct a universal r.e. set in the following manner: For any (n, x) we construct a set Un,, E 8 such that the set of all (z, n, x ) such that z E U,,,, is r.e. We construct the set Un,x by steps, and on step s we build a finite approximation U,,.x,s of U,,,,, and finally we take Let us describ