Timeline for Are all degree-1 cohomology operations Bocksteins?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 29, 2022 at 13:34 | vote | accept | Andi Bauer | ||
| Jan 29, 2022 at 3:48 | history | became hot network question | |||
| Jan 28, 2022 at 20:50 | answer | added | John Rognes | timeline score: 16 | |
| Jan 28, 2022 at 20:46 | comment | added | Will Sawin | We can make $K(G,i)$ by gluing to a point one $i$-cell for each generator of $G$, then one $i+1$-cell for each relation, and then additional cells to kill the remaining homotopy groups. The remaining homotopy groups are in degree $i+1$ and above, so we kill them by adding cells of dimension $i+2$ and above, which can't add any new cohomology classes in degree $i+1$. Then the cells we added in degree $i+1$ for the relations must give the Bocksteins. | |
| Jan 28, 2022 at 19:46 | history | asked | Andi Bauer | CC BY-SA 4.0 |