Countable ordinals and the analytical hierarchy, II

DOI10.1016/0003-4843(78)90010-4zbMath0449.03047OpenAlexW2346275115MaRDI QIDQ3895458

Alexander S. Kechris

Publication date: 1978

Published in: Annals of Mathematical Logic (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1016/0003-4843(78)90010-4

zbMATH Keywords

relativizationanalytical hierarchycountable ordinalsQ-theorywellorderingsprojective ordinalsnormal measuresdefinable determinacysecond-order hierarchy

Mathematics Subject Classification ID

Descriptive set theory (03E15) Computability and recursion theory on ordinals, admissible sets, etc. (03D60) Higher-type and set recursion theory (03D65) Determinacy principles (03E60) Hierarchies of computability and definability (03D55)

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