Abstract
We give a new proof of Friedman's conjecture that every uncountable $\Delta_{1}^{1}$ set of reals has a member of each hyperdegree greater than or equal to the hyperjump.
Citation
Liang Yu. "A new proof of Friedman's conjecture." Bull. Symbolic Logic 17 (3) 455 - 461, September 2011. https://doi.org/10.2178/bsl/1309952321
Information
Published: September 2011
First available in Project Euclid: 6 July 2011
zbMATH: 1242.03064
MathSciNet: MR2856081
Digital Object Identifier: 10.2178/bsl/1309952321
Subjects:
Primary:
03D30
Rights: Copyright © 2011 Association for Symbolic Logic
