Timeline for When does $\operatorname{Aut}(X)=\operatorname{Bir}(X)$ hold?
Current License: CC BY-SA 4.0
5 events
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| Jul 14, 2022 at 22:04 | history | edited | LSpice | CC BY-SA 4.0 |
While this is on the front page, error in book name; link to answer and comment
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| Jan 31, 2013 at 13:49 | comment | added | diverietti | Yes, of course, I misunderstood what you wrote! Cheers ! | |
| Jan 31, 2013 at 10:50 | comment | added | Henri | Yes, Y. Consider the two projection $p_1$, $p_2$ from the graph to $X$ and $Y$. We know that the exceptional locus of $p_1$ contains rational curves $C \subset X\times Y$. By assumption, $p_2$ must contract $C$, so that $C$ is contracted by $p_1$ and $p_2$, which is absurd. | |
| Jan 31, 2013 at 10:28 | comment | added | diverietti | $Y$ containing no rational curves ? or $X$? | |
| Jan 31, 2013 at 10:08 | history | answered | Henri | CC BY-SA 3.0 |