Timeline for Smooth, non-isotrivial fibration with vanishing Kodaira-Spencer map at a point
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Jan 25, 2022 at 20:44 | vote | accept | Francesco Polizzi | ||
| Jan 25, 2022 at 20:10 | answer | added | Nikolas Kuhn | timeline score: 5 | |
| Jan 25, 2022 at 16:05 | comment | added | Francesco Polizzi | @NikolasKuhn: That's nice. Please write the explicit computation as an answer, and I will be glad to accept it. | |
| Jan 25, 2022 at 13:14 | comment | added | Nikolas Kuhn | Any ramified base change of a smooth, non-isotrivial fibration should give an example (the Kodaira map being trivial for the ramification points). | |
| Jan 25, 2022 at 13:02 | history | edited | Francesco Polizzi | CC BY-SA 4.0 |
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| Jan 25, 2022 at 12:57 | comment | added | Francesco Polizzi | @PiotrAchinger: In fact, I checked Kodaira's original reference, and he does prove (by means of a local computation) that the KS-map in his examples is non-zero at every point. So I undeleted and edited the question, asking for examples with KS-map vanishing at some point. | |
| Jan 25, 2022 at 12:55 | history | edited | Francesco Polizzi | CC BY-SA 4.0 |
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| Jan 25, 2022 at 12:54 | history | undeleted | Francesco Polizzi | ||
| Jan 25, 2022 at 12:37 | history | deleted | Francesco Polizzi | via Vote | |
| Jan 25, 2022 at 12:31 | comment | added | Piotr Achinger | This is vanishing at a point $y$, not in a neighborhood of $y$. The fact that the derivative a function vanishes at a point does not imply that the function is constant in a neighborhood of that point... | |
| Jan 25, 2022 at 12:26 | history | asked | Francesco Polizzi | CC BY-SA 4.0 |