Degree spectra of relations on computable structures in the presence of Δ20 isomorphisms

Journal of Symbolic Logic 67 (2):697-720 (2002)
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10.2178/jsl/1190150105

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The d.r.e. degrees are not dense.S. Cooper, Leo Harrington, Alistair Lachlan, Steffen Lempp & Robert Soare - 1991 - Annals of Pure and Applied Logic 55 (2):125-151.
Intrinsically Hyperarithmetical Sets.Ivan N. Soskov - 1996 - Mathematical Logic Quarterly 42 (1):469-480.

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