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Preserving measurability with Cohen iterations

Publikace na Filozofická fakulta |
2017

Tento text není v aktuálním jazyce dostupný. Zobrazuje se verze "en".Abstrakt

We describe a weak version of Laver indestructibility for a $\mu$-tall cardinal $\kappa$, $\mu > \kappa^{+}$, where ''weaker'' means that the indestructibility refers only to the Cohen forcing at $\kappa$ of a certain length. A special case of this construction is: if $\mu$ is equal to $\kappa^{+n}$ for some $1 < n < \omega$, then one can get a model $V^*$ where $\kappa$ is measurable, and its measurability is indestructible by $\Add(\kappa,\alpha)$ for any $0 < \alpha<\kappa^{+n}$ .