Six lectures on the stationary tower
نویسنده
چکیده
1.1 Definition. Let X be a nonempty set. A set c ⊂ P(X) is club in P(X) if there is a function f : X → X for which c is the set of A ⊂ X closed under f . Given a cardinal κ ≤ |X|, c is club in [X] (or in [X]) if c is the set of A ∈ [X] (or [X]) closed under f . A set a ⊂ P(X) is stationary in P(X) if it intersects every club subset of P(X), and stationary in [X] (or [X]) if it intersects every c which is club in [X] (or [X]).
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تاریخ انتشار 2012