Timeline for Example: a pair of nonisomorphic parallel morphisms with isomorphic cones
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 22, 2013 at 14:20 | vote | accept | Francesco Genovese | ||
| Jan 22, 2013 at 14:19 | comment | added | Francesco Genovese | I'm checking this example in detail, I'm quite sure it works. I will accept this answer, I think it's the "simplest" one given here. Of course, I would like to thank the other answerers, too: I believe that all examples given here are correct. | |
| Jan 22, 2013 at 0:56 | comment | added | Dag Oskar Madsen | Changed the ring after Eric's suggestion. | |
| Jan 22, 2013 at 0:53 | history | edited | Dag Oskar Madsen | CC BY-SA 3.0 |
Changed the ring $R$ after Eric's suggestion; added 22 characters in body
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| Jan 22, 2013 at 0:28 | comment | added | Dag Oskar Madsen | Sure, might be better. I'm used to thinking small $k$-dimension, but here maybe small homological dimension is more relevant :) | |
| Jan 22, 2013 at 0:07 | comment | added | Eric Wofsey | If you work instead over a full polynomial ring $k[x,y]$, this gives an example where both $A$ and $B$ are perfect complexes. | |
| Jan 21, 2013 at 23:42 | history | answered | Dag Oskar Madsen | CC BY-SA 3.0 |