151. RETRACTED – MEASURING CLUB-SEQUENCES TOGETHER WITH THE CONTINUUM LARGE
- Author
-
David Asperó and Miguel Angel Mota
- Subjects
Discrete mathematics ,Sequence ,Aleph ,Forcing (recursion theory) ,Logic ,010102 general mathematics ,0102 computer and information sciences ,01 natural sciences ,Omega ,Combinatorics ,Philosophy ,010201 computation theory & mathematics ,Countable set ,Continuum (set theory) ,0101 mathematics ,Symmetry (geometry) ,Mathematics - Abstract
Measuring says that for every sequence ${\left( {{C_\delta }} \right)_{\delta < {\omega _1}}}$ with each ${C_\delta }$ being a closed subset of δ there is a club $C \subseteq {\omega _1}$ such that for every $\delta \in C$ , a tail of $C\mathop \cap \nolimits \delta$ is either contained in or disjoint from ${C_\delta }$ . We answer a question of Justin Moore by building a forcing extension satisfying measuring together with ${2^{{\aleph _0}}} > {\aleph _2}$ . The construction works over any model of ZFC + CH and can be described as a finite support forcing iteration with systems of countable structures as side conditions and with symmetry constraints imposed on its initial segments. One interesting feature of this iteration is that it adds dominating functions $f:{\omega _1} \to {\omega _1}$ mod. countable at each stage.
- Published
- 2017