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Summability invariants

✍ Scribed by Moray S. Macphail


Publisher
Springer-Verlag
Year
1977
Tongue
French
Weight
46 KB
Volume
153
Category
Article
ISSN
0025-5874

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It is proved, under Martin's Axiom, that all (!1; !1) gaps in P(N)=ΓΏn 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, i