Timeline for Singular locus of a family of cubic surfaces
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 12, 2021 at 3:19 | vote | accept | Edward Teach | ||
| Sep 11, 2021 at 14:32 | answer | added | Will Sawin | timeline score: 3 | |
| Sep 11, 2021 at 14:04 | comment | added | Edward Teach | Exactly. I need the formula for the divisor $\Delta$. | |
| Sep 11, 2021 at 14:00 | comment | added | Will Sawin | To check it is a divisor, we have to locally check it is the vanishing locus of a polynomial. Locally, we may assume $E$ is trivial, so $s$ is given by a cubic polynomial in four variables, and $\Delta$ is the vanishing locus of the discriminant of this cubic polynomial. Is the formula for the discriminant the formula you're looking for, or do you want the formula for the divisor class of $\Delta$? | |
| Sep 11, 2021 at 13:57 | history | edited | Edward Teach | CC BY-SA 4.0 |
added 69 characters in body
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| Sep 11, 2021 at 13:48 | history | asked | Edward Teach | CC BY-SA 4.0 |