Ineffability of P κ λ for λ with small cofinality
نویسندگان
چکیده
منابع مشابه
Cofinality of normal ideals on [λ]<κ I
An ideal J on [λ] is said to be [δ]-normal, where δ is an ordinal less than or equal to λ, and θ a cardinal less than or equal to κ, if given Be ∈ J for e ∈ [δ] <θ , the set of all a ∈ [λ] such that a ∈ Be for some e ∈ [a ∩ δ] lies in J . We give necessary and sufficient conditions for the existence of such ideals and describe the smallest one, denoted by NS [δ] κ,λ . We compute the cofinality ...
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ژورنال
عنوان ژورنال: Journal of the Mathematical Society of Japan
سال: 2008
ISSN: 0025-5645
DOI: 10.2969/jmsj/06030935