Timeline for When does the relative differential $df=0$ imply that $f$ comes from the base?
Current License: CC BY-SA 3.0
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| Jun 22, 2022 at 15:35 | comment | added | PrimeRibeyeDeal | @QingLiu thank you for this informative answer. What about the somewhat orthogonal case, of finite flat maps like extensions $\mathcal{O}_L/\mathcal{O}_K$ of number rings? One knows the differentials will be supported on the ramification locus, but how much more can be said? Is there a good reference for this? | |
| Sep 15, 2011 at 0:58 | comment | added | Allen Knutson | Better and better! | |
| Sep 14, 2011 at 21:09 | history | edited | Qing Liu | CC BY-SA 3.0 |
Remove smoothness condition.
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| Sep 14, 2011 at 19:26 | vote | accept | Allen Knutson | ||
| Sep 14, 2011 at 0:39 | history | edited | Qing Liu | CC BY-SA 3.0 |
More general statement ?
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| Sep 14, 2011 at 0:16 | history | answered | Qing Liu | CC BY-SA 3.0 |