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\(\Pi^1_1\) sets of sets, hyperdegrees and related problems - MaRDI portal

\(\Pi^1_1\) sets of sets, hyperdegrees and related problems

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Publication:2560400

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DOI10.2969/JMSJ/02540609zbMath0261.02029OpenAlexW2030484414MaRDI QIDQ2560400

Publication date: 1973

Published in: Journal of the Mathematical Society of Japan (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2969/jmsj/02540609

Mathematics Subject Classification ID

Descriptive set theory (03E15) Other degrees and reducibilities in computability and recursion theory (03D30) Hierarchies of computability and definability (03D55)

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