Timeline for Does nefness carry over through flips?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Apr 27, 2020 at 3:20 | comment | added | Hacon | More precisely, for a klt flip, it carries through iff $D\cdot \Sigma =0$ where $\Sigma$ is the flipping curve (else $D\cdot \Sigma >0$ and so $\overline{\pi(D)} \cdot \Sigma ^+<0$ where $\Sigma ^+$ is a flipped curve....if $D\cdot \Sigma=0$, use the base point free thm). This fact is important when running the mmp with scaling. | |
| S Apr 26, 2020 at 23:45 | history | suggested | Sophie M | CC BY-SA 4.0 |
fixed dashed right arrow
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| Apr 26, 2020 at 23:17 | review | Suggested edits | |||
| S Apr 26, 2020 at 23:45 | |||||
| Apr 26, 2020 at 21:21 | comment | added | Ennio Mori cone | No, $\overline{\pi(D)}$ will typically have a non-empty base locus where it is negative - try to see what happens in the Atiyah flop.. | |
| Apr 26, 2020 at 21:16 | history | asked | anonymous | CC BY-SA 4.0 |