Timeline for Non isomorphic two term complexes with isomorphic kernel, image and cokernel
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 6, 2019 at 1:28 | comment | added | David E Speyer | Thanks! I don't know if it helps anyone else, but I find it helpful to write this more symmetrically as $k[x_1, x_2, y, z]/(x_2-x_1 y,\ x_1 - x_2 z)$. The point is that $x_1$ divides $x_2$ and $x_2$ divides $x_1$, but there is no unit $u$ with $x_1 = u x_2$. | |
| Oct 6, 2019 at 1:17 | vote | accept | David E Speyer | ||
| Oct 5, 2019 at 20:44 | history | edited | Jeremy Rickard | CC BY-SA 4.0 |
I believe myself now!
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| Oct 5, 2019 at 9:46 | history | answered | Jeremy Rickard | CC BY-SA 4.0 |