Timeline for Bruhat ordering and non-vanishing Extension groups
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Sep 7, 2019 at 22:29 | comment | added | Rafael Mrden | @JimHumphreys: By the way, thank you for your book! It has been quite helpful. :) | |
| Sep 7, 2019 at 22:25 | comment | added | Rafael Mrden | @JimHumphreys: I meant that $\Sigma$ consists of just one root, the one that corresponds to the simple reflection $s$. Equivalently, the stabilizer of $\mu$ in $W$ is $\{1,s\}$. | |
| Sep 7, 2019 at 21:28 | comment | added | Jim Humphreys | @Rafael: What do you mean by "$s$ is singular" in your second sentence? | |
| Sep 3, 2019 at 7:02 | comment | added | James Cheung | Thank you very much. | |
| Sep 3, 2019 at 6:56 | comment | added | Rafael Mrden | More precisely, Proposition 1.3.1. in the paper I mentioned. | |
| Sep 3, 2019 at 6:55 | comment | added | Rafael Mrden | You can read a bit in Humphreys Category O book, the last section. The canonical reference is Beilinson-Ginzburg-Soergel: Koszul Duality Patterns in Representation Theory, J. Amer. Math. Soc. 9 (1996), 473-527. | |
| Sep 3, 2019 at 6:22 | comment | added | James Cheung | I want to know more about Koszul-dual and the fact that the dimensions of Ext-group correspond to the multiplicities of simples inside generalized Verma modules. Do you have a reference for that? Please help me. | |
| Sep 2, 2019 at 12:53 | history | edited | Rafael Mrden | CC BY-SA 4.0 |
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| Sep 2, 2019 at 12:27 | vote | accept | James Cheung | ||
| Sep 2, 2019 at 10:52 | history | edited | Rafael Mrden | CC BY-SA 4.0 |
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| Sep 2, 2019 at 10:37 | history | answered | Rafael Mrden | CC BY-SA 4.0 |