Timeline for Extension class and cup product
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 10, 2015 at 15:24 | comment | added | Filippo Alberto Edoardo | I was trying to come up with a precise and detailed proof, but ended up in being stuck. If you take $u\in H^p(X;M'')$ to be $1$ (I guess that by $1$ you mean the neutral element of the cohomology group) you do not have something related to the exact sequence you started with, because $H^p(X;M)=\mathrm{Ext}^p(O_X,M'')\neq \mathrm{Ext}^p(M',M'')$... | |
| Feb 1, 2013 at 15:58 | vote | accept | Marc | ||
| Feb 1, 2013 at 12:41 | history | answered | Mark Grant | CC BY-SA 3.0 |