Timeline for Closed sets in ordinal spaces
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 18, 2015 at 4:43 | comment | added | Mohammad Golshani | It doesn't work,for example then $\kappa_{\omega}$ should be in both of $X$ and $Y$. | |
| Jan 16, 2015 at 20:36 | comment | added | Ergonvi | But the same argument wouldn't be right for cardinals with uncontable cofinality? I mean for example, $X=\bigcup_{\alpha <\omega_1} (\kappa_{2\alpha},\kappa_{2\alpha+1}]$ and $Y=\bigcup_{\alpha <\omega_1} (\kappa_{2\alpha+1},\kappa_{2\alpha}]$... | |
| Jan 5, 2015 at 17:59 | comment | added | Ergonvi | Oh, that's right... Thank you @Mohammad Golshani! :) | |
| Jan 5, 2015 at 10:25 | comment | added | Mohammad Golshani | That's trivial, for example $|X|=\Sigma_n \kappa_{2n+1}=\kappa.$ Similarly $|Y|=\Sigma_n \kappa_{2n+2}=\kappa.$ | |
| Jan 5, 2015 at 10:03 | comment | added | Ergonvi | Thank you @Mohammad Golshani ! But why $X$ and $Y$ have cardinality $\kappa$? | |
| Jan 5, 2015 at 9:58 | history | undeleted | Mohammad Golshani | ||
| Jan 5, 2015 at 9:57 | history | deleted | Mohammad Golshani | via Vote | |
| Jan 5, 2015 at 9:56 | history | answered | Mohammad Golshani | CC BY-SA 3.0 |