Timeline for Centralizers in the universal central extensions of the alternating groups?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 10, 2015 at 9:37 | comment | added | YCor | Ah I see, because $y\mapsto [x,y]$ is a homomorphism from the inverse image of the centralizer of $x$ to the center. | |
| Feb 10, 2015 at 9:19 | comment | added | Derek Holt | But they have index at most $2$ in the inverse image of the centralizer of $x$. | |
| Feb 10, 2015 at 8:25 | comment | added | YCor | What do you mean? If you have $x$ and a lift $x'$, then clearly the centralizer of $x'$ is contained in the inverse image of the centralizer of $x$. But the other inclusion is unclear, could you elaborate? | |
| Feb 10, 2015 at 8:07 | vote | accept | Qiaochu Yuan | ||
| Feb 10, 2015 at 7:51 | history | answered | Dima Pasechnik | CC BY-SA 3.0 |