Timeline for Can Friedman's property fail at or above a supercompact cardinal?
Current License: CC BY-SA 4.0
3 events
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May 16 at 8:18 | comment | added | Hannes Jakob | Thank you very much! Do you know perchance why this is still listed as one of the problems, despite other problems being updated to show their resolution? | |
May 16 at 8:08 | comment | added | Chris Lambie-Hanson | To see why $FP_\kappa$ fails after forcing with $\mathrm{Coll}(\omega, \omega_1)$: work in $M$, and let $\dot{f}$ be a name for a continuous, increasing map from $\omega_2^M$ to $A_\kappa$. Then we can find a single condition $p$ that decides the value of $\dot{f}(\alpha)$ for cofinally many $\alpha < \omega_2^M$. But since $\dot{f}$ is forced to be continuous, $p$ actually decides the value of $\dot{f}$ on a club, so we have a closed subset of order type $\omega_2^M$ inside $A_\kappa$ in $M$ itself, which is a contradiction. | |
May 15 at 19:14 | history | answered | Hannes Jakob | CC BY-SA 4.0 |