Covering of the null ideal may have countable cofinality
2000; Polish Academy of Sciences; Volume: 166; Linguagem: Inglês
ISSN
1730-6329
Autores Tópico(s)Mathematical and Theoretical Analysis
ResumoWe prove that it is consistent that the covering number of the ideal of measure zero sets has countable cofinality. 0. Introduction. In the present paper we show that it is consistent that the covering of the null ideal has countable cofinality. Recall that the covering number of the null ideal (i.e. the ideal of measure zero sets) is defined as cov(null) = min n |P| : P null and ( A2P A = R (= ! 2) o
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