Extending Cooper’s theorem to Δ 3 0 Turing degrees

DOI10.3233/COM-180085zbMath1435.03071OpenAlexW2790900430MaRDI QIDQ4683156

Victor L. Selivanov, M. M. Yamaleev

Publication date: 20 September 2018

Published in: Computability (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.3233/com-180085

zbMATH Keywords

arithmetical hierarchyTuring degreesErshov's hierarchyfine hierarchy\(\Sigma_2^0\)-sets

Mathematics Subject Classification ID

Recursively (computably) enumerable sets and degrees (03D25) Other Turing degree structures (03D28) Hierarchies of computability and definability (03D55)

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Non-collapse of the effective Wadge hierarchy ⋮ Turing reducibility in the fine hierarchy ⋮ On the main scientific achievements of Victor Selivanov ⋮ Precomplete numberings

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