Timeline for Gorenstein projective modules of a certain triangular matrix algebra
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 10, 2018 at 12:40 | vote | accept | Mare | ||
| Nov 10, 2018 at 12:22 | comment | added | Jeremy Rickard | @Mare Yes, $\widehat{\text{Ext}}^0$ is stable $\text{Hom}$. | |
| Nov 10, 2018 at 12:17 | comment | added | Mare | Thanks. One question: Is $\hat{Ext_B}^0(X,M))=\underline{Hom_B}(X,M)$? Ill try my luck a bit to look for question 2 with $B=K<x,y>/(x^2,y^2,xy-qyx)$ since there such modules $M$ exists when q is not a root of unity and maybe in some cases there can be only finitely many such X, at least it looks like a very strong condition that this ext vanishes for all $i \in \mathbb{Z}$. | |
| Nov 10, 2018 at 11:59 | history | answered | Jeremy Rickard | CC BY-SA 4.0 |