Timeline for The composition of derived functors - commutation fails hazardly?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 21, 2011 at 16:18 | vote | accept | Sasha | ||
| Dec 21, 2011 at 16:18 | vote | accept | Sasha | ||
| Dec 21, 2011 at 16:18 | |||||
| Dec 21, 2011 at 12:33 | vote | accept | Sasha | ||
| Dec 21, 2011 at 16:18 | |||||
| Dec 20, 2011 at 23:50 | comment | added | Tyler Lawson | If you're unconvinced by the nice answers below that this is actually a ubiquitous phenomenon, consider the following. Suppose you have a ring homomorphism $R \to S$ and let $F$ be the restriction from $S$-modules to $R$-modules. Then the difference between derived functors comes from a very concrete difference between resolutions by projective $R$-modules and by projective $S$-modules. | |
| Dec 20, 2011 at 21:36 | answer | added | Leonid Positselski | timeline score: 21 | |
| Dec 20, 2011 at 16:03 | comment | added | Benjamin Steinberg | The paper William W Adams, Marc A Rieffel. Adjoint functors and derived functors with an application to the cohomology of semigroups Journal of Algebra, V. 7, N 1, 1967, 25-34 may be relevant. | |
| Dec 20, 2011 at 15:08 | answer | added | Angelo | timeline score: 14 | |
| Dec 20, 2011 at 14:54 | history | asked | Sasha | CC BY-SA 3.0 |