
doi: 10.1017/jsl.2013.24
AbstractIt is well known that saturation of ideals is closely related to the “antichain-catching” phenomenon from Foreman–Magidor–Shelah [10]. We consider several antichain-catching properties that are weaker than saturation, and prove:(1)If${\cal I}$is a normal ideal on$\omega _2 $which satisfiesstationary antichain catching, then there is an inner model with a Woodin cardinal;(2)For any$n \in \omega $, it is consistent relative to large cardinals that there is a normal ideal${\cal I}$on$\omega _n $which satisfiesprojective antichain catching, yet${\cal I}$is not saturated (or even strong). This provides a negative answer to Open Question number 13 from Foreman’s chapter in the Handbook of Set Theory ([7]).
antichain catching and self-genericity, General Mathematics, Pure mathematics, Computation Theory and Mathematics, Applied mathematics, Pure Mathematics, Mathematical Sciences, Philosophy, Mathematics, Theory of computation
antichain catching and self-genericity, General Mathematics, Pure mathematics, Computation Theory and Mathematics, Applied mathematics, Pure Mathematics, Mathematical Sciences, Philosophy, Mathematics, Theory of computation
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