On the cofinality of the splitting number

by Dow and Shelah. [DwSh:1127]
Indagationes Math, 2018
The splitting number s 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 [textit {Ultrafilters with small generating sets}, {Israel J. Math.}, textbf {65}, {(1989)}]


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