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arxiv: math/9309209 · v1 · pith:S6UH62CVnew · submitted 1993-09-16 · 🧮 math.LO

Possible Behaviours of the Reflection Ordering of Stationary Sets

classification 🧮 math.LO
keywords kappastationaryorderingalphareflectionforallfoundedposet
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If $S,T$ are stationary subsets of a regular uncountable cardinal $\kappa$, we say that $S$ reflects fully in $T$, $S<T$, if for almost all $\alpha \in T$ (except a nonstationary set) $S \cap \alpha$ is stationary in $\alpha .$ This relation is known to be a well founded partial ordering. We say that a given poset $P$ is realized by the reflection ordering if there is a maximal antichain $\langle X_p ; p \in P \rangle$ of stationary subsets of $Reg(\kappa)$ so that $$\forall p,q \in P \; \forall S\subseteq X_p, T\subseteq X_q \text{ stationary}:(S<T \leftrightarrow p<_P q ) .$$ We prove that if $\kappa$ is $\Cal P _2 \kappa -$strong and $P$ an arbitrary well founded poset of cardinality $\leq \k^+$ then there is a generic extension where P is realized by the reflection ordering on $\kappa .$

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