A $Delta^02$ Set with Barely $Sigma^02$ Degree

Journal of Symbolic Logic 64 (4):1700-1718 (1999)

Abstract
We construct a $\Delta^0_2$ degree which fails to be computably enumerable in any computably enumerable set strictly below $\emptyset'$
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DOI http://projecteuclid.org/euclid.jsl/1183745948
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