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  1. (1 other version)Some new natural α-RE-Degrees.Colin G. Bailey - 1987 - Journal of Symbolic Logic 52 (1):227-231.
    If α is a singular cardinal (either real or fake) in L, I exhibit many natural α-re subsets, defined uniformly from the ▵ 1 subsets of α. If α is a true cardinal this provides an uppersemilattice (usl) embedding from the lattice of ▵ 1 subsets of α into the usl of α-re-degrees. It will also be shown that this embedding cannot be extended to the Σ 1 subsets of α.
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