The distribution of properly Σ20 e-degrees

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Journal of Symbolic Logic 65 (1):19-32 (2000)
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Abstract

We show that for every enumeration degree $a there exists an e-degree c such that $a \leq c , and all degrees b, with $c \leq b , are properly Σ 0 2

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10.2307/2586524

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References found in this work

Theory of Recursive Functions and Effective Computability.Hartley Rogers - 1971 - Journal of Symbolic Logic 36 (1):141-146.
Properly Σ2 Enumeration Degrees.S. B. Cooper & C. S. Copestake - 1988 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 34 (6):491-522.
Properly Σ2 Enumeration Degrees.S. B. Cooper & C. S. Copestake - 1988 - Mathematical Logic Quarterly 34 (6):491-522.

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