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  1. Isolated maximal d.r.e. degrees.Yong Liu - 2019 - Annals of Pure and Applied Logic 170 (4):515-538.
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  • Weak Density and Nondensity among Transfinite Levels of the Ershov Hierarchy.Yong Liu & Cheng Peng - 2020 - Notre Dame Journal of Formal Logic 61 (4):521-536.
    We show that for any ω-r.e. degree d and n-r.e. degree b with d
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