On the cofinality of the splitting number
classification
🧮 math.LO
keywords
numbersplittingauthorblasscofinalityconstructfiniteforcing
read the original abstract
The splitting number can be singular. The key method is to construct a forcing poset with finite support matrix iterations of ccc posets introduced by Blass and the second author "Ultrafilters with small generating sets", Israel J. Math., 65, (1989)
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