Abstract
AbstractVarious equivalents and weakenings of the combinatorial principle ◊ are considered. The paper contains both absolute results and consistency results. Also included is a new characterisation of the notion of a stationary subset of ω1.
Publisher
Cambridge University Press (CUP)
Reference9 articles.
1. A weak version of ◊ which follows from 2ℵ 0<2ℵ 1
2. Iterated Souslin forcing, the principles ◊(E), and a generalisation of the axiom SAD;Devlin;Israel Journal of Mathematics
3. ℵ1-TREES
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