Timeline for Question on simple modules and projective covers
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Feb 17, 2021 at 20:24 | comment | added | Mark Wildon | I’m voting to close this question because it is quite basic and answered in a comment. | |
| Feb 17, 2021 at 14:05 | review | Close votes | |||
| Feb 23, 2021 at 3:02 | |||||
| Feb 17, 2021 at 11:23 | history | edited | mathStudent | CC BY-SA 4.0 |
deleted 307 characters in body; edited title
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| Feb 17, 2021 at 11:08 | history | edited | mathStudent | CC BY-SA 4.0 |
edited title
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| Dec 17, 2020 at 20:14 | vote | accept | mathStudent | ||
| Dec 17, 2020 at 20:04 | answer | added | Keith Kearnes | timeline score: 3 | |
| Dec 17, 2020 at 19:47 | comment | added | Alex B. | The head of a projective indecomposable module over an Artinian ring is simple, so there is exactly one isomorphism class of simples that $P_S$ can surject onto (the equality should really be an isomorphism, not an equality). I am sure this is in Alperin, but I don't have the book in front of me right now. | |
| Dec 17, 2020 at 18:30 | comment | added | mathStudent | Yes, this is exactly what $\theta_s$ is. | |
| Dec 17, 2020 at 18:27 | comment | added | Johannes Hahn | What is $\theta_S$ ? If I had to guess, I'd say it is the morphism $P_S \twoheadrightarrow S \hookrightarrow I_S$. Is that correct? | |
| Dec 17, 2020 at 18:22 | history | asked | mathStudent | CC BY-SA 4.0 |