Timeline for Higher order differentials of Bockstein spectral sequence
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 27, 2022 at 0:43 | vote | accept | Nanjun Yang | ||
| Jun 24, 2022 at 14:54 | comment | added | IJL | In general, higher differentials are higher cohomology operations, defined only on the kernels of the differentials below them. If $a$ is a mod-2 cohomology class with $Sq^1(a)=0$, this says that the coboundary $b$ of an integral lift of $a$ is divisible by~2. The secondary operation in this case looks at $b/2$ as a mod-2 cocycle; this is defined only because $b$ was 0 mod-2. | |
| Jun 24, 2022 at 1:40 | comment | added | Nanjun Yang | Is the $d_2$ some kind of cohomological operation for which some references could be found? | |
| Jun 23, 2022 at 10:24 | history | answered | IJL | CC BY-SA 4.0 |