Timeline for Existence of birational sections over a center of an exceptional divisor
Current License: CC BY-SA 4.0
8 events
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| Sep 14, 2020 at 14:16 | comment | added | Ray Lai | Kostya: Yes, you are right. I apologize for making another mistake. From Mori's list of extremal contraction on smooth threefolds, one can contract a singular irreducible reduced quadric Q in P^3 to a terminal point. The surface Q is RCC, but not RC. | |
| Sep 14, 2020 at 14:13 | history | edited | Ray Lai | CC BY-SA 4.0 |
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| Dec 28, 2019 at 17:33 | comment | added | kostya | Dear Ray Lai, as far as I can see Hacon and McKernan assert rational chain connectedness of E. Is E in fact rational connected? | |
| Nov 24, 2017 at 8:49 | comment | added | Ray Lai | Sorry, you are right. Artin-Mumford's conic bundle over $\mathbb{P}^2$ is a unirational but non-stably-rational variety. A related survey is given by Piruka | |
| Nov 24, 2017 at 8:48 | history | edited | Ray Lai | CC BY-SA 3.0 |
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| Sep 27, 2017 at 8:52 | comment | added | Li Yutong | Thank you for your answer! Why "1. when $W$ is also rationally connected" implies the existence of a section following from GHMZ's paper? Which result did you refer to? | |
| Sep 26, 2017 at 7:38 | review | First posts | |||
| Sep 26, 2017 at 7:39 | |||||
| Sep 26, 2017 at 7:33 | history | answered | Ray Lai | CC BY-SA 3.0 |