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  1. Set Theory.Keith J. Devlin - 1981 - Journal of Symbolic Logic 46 (4):876-877.
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  • A very absolute Pi-1-2 real singleton.René David - 1982 - Annals of Mathematical Logic 23 (2-3):101-120.
    I give a class forcing that adds a real which is Pi-1-2 and for which no forcing extension (by a set of conditions) can destroy this definability.
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  • A very absolute Π21 real singleton.René David - 1982 - Annals of Mathematical Logic 23 (2-3):101-120.
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  • Δ31 reals.René David - 1982 - Annals of Mathematical Logic 23 (2-3):121-125.
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