Detailed Medvedev-degree analysis of analytic choice principles solves the Weihrauch degree of parallelized Σ¹₁-choice on ℕ using Harrington's jump-hierarchy result.
Classes of Polish spaces under effective Borel isomorphism
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A comparison of various analytic choice principles
Detailed Medvedev-degree analysis of analytic choice principles solves the Weihrauch degree of parallelized Σ¹₁-choice on ℕ using Harrington's jump-hierarchy result.