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  1. Forcing with tagged trees.John R. Steel - 1978 - Annals of Mathematical Logic 15 (1):55.
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  • A degree-theoretic definition of the ramified analytical hierarchy.Carl G. Jockusch & Stephen G. Simpson - 1976 - Annals of Mathematical Logic 10 (1):1-32.
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  • On the Π1 1 -separation principle.Antonio Montalbán - 2008 - Mathematical Logic Quarterly 54 (6):563-578.
    We study the proof-theoretic strength of the Π11-separation axiom scheme, and we show that Π11-separation lies strictly in between the Δ11-comprehension and Σ11-choice axiom schemes over RCA0.
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