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  1. There may be simple Pℵ1 and Pℵ2-points and the Rudin-Keisler ordering may be downward directed.Andreas Blass & Saharon Shelah - 1987 - Annals of Pure and Applied Logic 33 (C):213-243.
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  • Iterated perfect-set forcing.James E. Baumgartner & Richard Laver - 1979 - Annals of Mathematical Logic 17 (3):271-288.
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  • Specialising Aronszajn trees by countable approximations.Heike Mildenberger & Saharon Shelah - 2003 - Archive for Mathematical Logic 42 (7):627-647.
    We show that there are proper forcings based upon countable trees of creatures that specialise a given Aronszajn tree.
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  • The fine structure of the constructible hierarchy.R. Björn Jensen - 1972 - Annals of Mathematical Logic 4 (3):229.
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