Timeline for Group structure extension
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 4, 2021 at 21:15 | comment | added | Giulio | @DenisT. can you say exactly which of cohomology group control this extension problem? Meaning specify the cotriple, the functors, and where one has to compute them. Thanks! | |
| Jul 3, 2021 at 18:09 | comment | added | Denis T | In theory cotriple cohomology provides an answer for all extension problems of this sort; in practice, it's seldom computable. | |
| Jul 2, 2021 at 16:42 | comment | added | LSpice | Presumably you mean group structures on $H$ such that there is a group embedding $i : G \to H$ over $G$ (or maybe I mean under …), together with some hypothesis on the resulting projection $H/i(G) \to X$ (maybe that the projection intertwines the action of $G$ on $H/i(G)$ by left translation with the given action of $G$ on $X$)? | |
| Jul 2, 2021 at 16:29 | history | edited | Giulio | CC BY-SA 4.0 |
added 165 characters in body
|
| Jul 2, 2021 at 15:53 | history | asked | Giulio | CC BY-SA 4.0 |