Graduate studies at Western
Journal of Symbolic Logic 47 (2):275-288 (1982)
|Abstract||Let κ B be the least cardinal for which the Baire category theorem fails for the real line R. Thus κ B is the least κ such that the real line can be covered by κ many nowhere dense sets. It is shown that κ B cannot have countable cofinality. On the other hand it is consistent that the corresponding cardinal for 2 ω 1 be ℵ ω . Similar questions are considered for the ideal of measure zero sets, other ω 1 saturated ideals, and the ideal of zero-dimensional subsets of R ω 1|
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