Timeline for The square of a ccc topological group
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 30, 2017 at 22:30 | vote | accept | Santi Spadaro | ||
| Dec 29, 2017 at 15:30 | answer | added | Ramiro de la Vega | timeline score: 4 | |
| Dec 28, 2017 at 16:13 | comment | added | Santi Spadaro | Very nice, I'll have a look at that. Of course Todorcevic's ZFC-examples can't be made ccc, because under $MA_{\omega_1}$ the ccc is productive, but I don't know any example of a group where the cellularity increases in the square, so that is very interesting. | |
| Dec 27, 2017 at 20:24 | comment | added | Taras Banakh | In the book of Arkangelski and Tkachenko in Exercise 5.4.G it is written that Todorcevic constructed a ZFC-example of a topological group $G$ with $c(G)<c(G\times G)$. I have no access to Todorcevic' book "Partiotion Problems in Topology" to check if his group can be made countably cellular. | |
| Dec 27, 2017 at 9:03 | history | asked | Santi Spadaro | CC BY-SA 3.0 |