On some generalizations of a fixed point theorem. (English. Russian original) Zbl 0523.03029
Sov. Math. 25, No. 5, 1-10 (1981); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No. 5(228), 9-16 (1981).
MSC:
03D25 | Recursively (computably) enumerable sets and degrees |
03D20 | Recursive functions and relations, subrecursive hierarchies |
03D30 | Other degrees and reducibilities in computability and recursion theory |