Summable gaps
نویسندگان
چکیده
منابع مشابه
Summable gaps
It is proved, under Martin’s Axiom, that all (ω1, ω1) gaps in P(N) / fin are indestructible in any forcing extension by a separable measure algebra. This naturally leads to a new type of gap, a summable gap. The results of these investigations have applications in Descriptive Set Theory. For example, it is shown that under Martin’s Axiom the Baire categoricity of all ∆3 non-∆ 1 3-complete sets ...
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ژورنال
عنوان ژورنال: Annals of Pure and Applied Logic
سال: 2003
ISSN: 0168-0072
DOI: 10.1016/s0168-0072(02)00034-9