MathSciNet bibliographic data MR349367 (50 #1861) 02F30 Nelson, G. C. Many-one reducibility within the Turing degrees of the hyperarithmetic sets \$H\sb{a}(x)\$$H\sb{a}(x)$. Trans. Amer. Math. Soc. 191 (1974), 1–44. Article

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