Timeline for Is direct image of simple $D$-module is also simple?
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 2, 2018 at 10:51 | vote | accept | Y. M. | ||
| Jun 2, 2018 at 4:02 | comment | added | Avi Steiner | @YukiMatsubara This means that it’s not a module, it’s a complex. It has cohomology in more than one degree (I don’t know how else to phrase that part). In order for it to be a simple module it needs to actually be, well, a module. | |
| May 31, 2018 at 14:13 | comment | added | Y. M. | Thank you very much. I am a beginner of $D$-module, so I cannot understand what do you mean by ''$\phi_+M$ has cohomology in more than one degree", and why this implies that $\phi_+M$ is not simple... I would be grateful if you would give me more explanation. | |
| May 28, 2018 at 22:37 | history | answered | Avi Steiner | CC BY-SA 4.0 |