Timeline for representing an uncountable free group as a union of an increasing sequence of countable subgroups
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 6, 2018 at 7:59 | comment | added | YCor | From wikipedia: a club set is a subset of a limit ordinal which is closed under the order topology, and is unbounded (see below) relative to the limit ordinal. The name club is a contraction of "closed and unbounded". | |
| Jul 6, 2018 at 5:26 | answer | added | Will Sawin | timeline score: 15 | |
| Jul 6, 2018 at 5:18 | history | asked | Tri | CC BY-SA 4.0 |