Timeline for Arithmetic projective duality
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Jan 12, 2017 at 18:39 | comment | added | Libli | @Bear : how do you define the projective dual of a double line? | |
| Jan 12, 2017 at 12:02 | comment | added | Bear | Probably I'm missing something, but aren't you saying that that there is an example in char 2 of a conic whose projective dual is a double line? So the projective dual is well defined but the conic won't be the dual of its dual. I don't see a problem with that. | |
| Jan 12, 2017 at 0:16 | history | edited | Libli | CC BY-SA 3.0 |
added 51 characters in body
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| Jan 12, 2017 at 0:13 | comment | added | Libli | @NoamD.Elkies : you are right, $\mathcal{C}^*$ is $a^{\perp}$ with multiplicity $2$. Hence the dual of $\mathcal{C}^*$ is not even well-defined. | |
| Jan 11, 2017 at 23:26 | comment | added | Noam D. Elkies | Not $a^\perp$ with multiplicity $2$? | |
| Jan 11, 2017 at 23:21 | history | answered | Libli | CC BY-SA 3.0 |