Timeline for local-global principles in group cohomology
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 20, 2010 at 5:33 | answer | added | Alex B. | timeline score: 2 | |
| Jan 19, 2010 at 13:09 | comment | added | Kevin Buzzard | One I see commonly in my area is when $G$ is the absolute Galois group of a global field (for example a number field) and the subgroups are the absolute Galois groups of the completions of the field (these are subgroups of $G$). In many instances local-global principles do not hold, and their failure is measured by a "class group" or "Tate-Schaferevich group". | |
| Jan 19, 2010 at 12:14 | history | asked | user19475 | CC BY-SA 2.5 |