Timeline for Tangent bundles and birational morphisms
Current License: CC BY-SA 3.0
5 events
when toggle format | what | by | license | comment | |
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May 10, 2014 at 16:14 | vote | accept | Puzzled | ||
Oct 5, 2013 at 9:43 | answer | added | Darius Math | timeline score: 3 | |
Oct 5, 2013 at 3:28 | comment | added | Sasha | And moreover, the kernel of $df$ is zero in this case. | |
Oct 5, 2013 at 1:33 | comment | added | Piotr Achinger | The sequence exists, but it won't be exact on the right. You always have the map $df:T_X\to f^* T_Y$, and you define $T_{X/Y}$ to be the kernel, but of course $df$ will not be surjective where $f$ is not smooth (in fact, smoothness of $f$ is equivalent to surjectivity). | |
Oct 4, 2013 at 20:57 | history | asked | Puzzled | CC BY-SA 3.0 |