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-Sets of reals

Journal of Symbolic Logic 53 (2):636-642 (1988)

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  1. Making doughnuts of Cohen reals.Lorenz Halbeisen - 2003 - Mathematical Logic Quarterly 49 (2):173-178.
    For a ⊆ b ⊆ ω with b\ a infinite, the set D = {x ∈ [ω]ω : a ⊆ x ⊆ b} is called a doughnut. A set S ⊆ [ω]ω has the doughnut property [MATHEMATICAL SCRIPT CAPITAL D] if it contains or is disjoint from a doughnut. It is known that not every set S ⊆ [ω]ω has the doughnut property, but S has the doughnut property if it has the Baire property ℬ or the Ramsey property ℛ. (...)
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