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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