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"Σ _1^1 in Every Real in a Σ _1^1 Class of Reals Is Σ _1^1."
Leo Harrington, Richard A. Shore, Theodore A. Slaman (2017)
- Leo Harrington, Richard A. Shore, Theodore A. Slaman:
Σ _1^1 in Every Real in a Σ _1^1 Class of Reals Is Σ _1^1. Computability and Complexity 2017: 455-466
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