Timeline for Question on an example about flatness in Hartshorne
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jun 21, 2011 at 19:23 | comment | added | Enrique Acosta | And thank you for the example on the lines too! | |
| Jun 21, 2011 at 19:14 | vote | accept | Enrique Acosta | ||
| Jun 21, 2011 at 19:14 | |||||
| Jun 21, 2011 at 12:35 | comment | added | Allen Knutson | You can see the same issue looking at the solutions of $y^2=t^2$ as $t$ varies. The total space is a reduced union of two lines, most fibers are two points, and one fiber is a double point. This is a case where the central fiber is again S1, which Hartshorne's example shows may fail. | |
| Jun 21, 2011 at 9:20 | history | edited | Francesco Polizzi | CC BY-SA 3.0 |
added 30 characters in body
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| Jun 21, 2011 at 9:05 | history | undeleted | Francesco Polizzi | ||
| Jun 21, 2011 at 9:02 | history | deleted | Francesco Polizzi | ||
| Jun 21, 2011 at 9:02 | history | answered | Francesco Polizzi | CC BY-SA 3.0 |