\Pi^0_1 classes, strong minimal covers and hyperimmune-free degrees

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Lewis, Andrew E. M.
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Abstract
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We investigate issues surrounding an old question of Yates' as to the existence of a minimal Turing degree with no strong minimal cover, specifically with respect to the hyperimmune-free degrees.
Comment: Bulletin of the London Mathematical Society (to appear in Dec 07 issue online)
Keywords
Mathematics - Logic, 03D28
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