Possible pcf algebras

Details Possible pcf algebras Possible pcf algebras

1994-12-03

arxiv.org/abs/math/9412208v1

Mathematics

Logic

Scientific paper

There exists a family $\{B_{\alpha}\}_{\alpha<\omega_1}$ of sets of countable ordinals such that o $\max B_{\alpha}=\alpha$, o if $\alpha\in B_{\beta}$ then $B_{\alpha}\subseteq B_{\beta}$, o if $\lambda\leq \alpha$ and $\lambda$ is a limit ordinal then $B_{\alpha}\cap\lambda$ is not in the ideal generated by the $B_{\beta}$, $\beta<\alpha$, and by the bounded subsets of $\lambda$, o there is a partition $\{A_n\}_{n=0}^{\infty}$ of $\omega_1$ such that for every $\alpha$ and every $n,$ $B_{\alpha}\cap A_n$ is finite.

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