Timeline for Group actions on affine space which are almost good
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Oct 19, 2016 at 18:54 | answer | added | Friedrich Knop | timeline score: 3 | |
| Oct 19, 2016 at 5:48 | history | edited | Francesco Polizzi | CC BY-SA 3.0 |
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| Oct 18, 2016 at 15:11 | review | Close votes | |||
| Oct 18, 2016 at 16:59 | |||||
| Oct 18, 2016 at 13:05 | comment | added | Francesco Polizzi | I have posted my comment above as an answer. | |
| Oct 18, 2016 at 13:04 | vote | accept | Miele | ||
| Oct 18, 2016 at 13:02 | answer | added | Francesco Polizzi | timeline score: 5 | |
| Oct 18, 2016 at 12:20 | comment | added | abx | In this example $\mathbb{A}^2/G$ is the quadratic cone in $\mathbb{A}^3$ defined by $v^2-uw=0$ (just put $u=x^2$, $v=xy$, $w=y^2$). Thus $Y/G$ is this quadratic cone minus its vertex. | |
| Oct 18, 2016 at 12:04 | history | edited | Miele | CC BY-SA 3.0 |
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| Oct 18, 2016 at 12:04 | comment | added | Miele | @FrancescoPolizzi Perfect. I should have realized that myself. Could I ask you to post it as an answer? By the way, just out of curiosity, what is $Y/G$ explicitly? It is a smooth quasi-affine variety with Picard group $\mathbb Z/2\mathbb Z$, as far as I can see. Is there a more explicit way of describing $Y/G$ (as an explicit open in some affine variety)? | |
| Oct 18, 2016 at 8:11 | comment | added | Francesco Polizzi | What about $\mathbb{Z}/2 \mathbb{Z}$ acting on $\mathbb{A}^2$ by $$(x, \, y) \mapsto (-x, -y)?$$ | |
| Oct 18, 2016 at 8:00 | review | First posts | |||
| Oct 18, 2016 at 8:01 | |||||
| Oct 18, 2016 at 7:59 | history | asked | Miele | CC BY-SA 3.0 |