Timeline for what notions are "geometric" (characterized by geometric fibers)?
Current License: CC BY-SA 2.5
8 events
| when toggle format | what | by | license | comment | |
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| Mar 25, 2010 at 17:24 | comment | added | Allen Knutson | @unknown (google): let X be A^1. Take X union (X minus point) -> X in the obvious way. | |
| Mar 25, 2010 at 10:24 | comment | added | Qfwfq | @James: maybe I'm just missing an easy point here, but, you indeed made me get a bit confused...Could you please tell me an example of a (let's say, surjective) morphism which is flat and has proper fibers but it's not a proper morphism? Thank you in advance. | |
| Mar 25, 2010 at 1:28 | comment | added | Dustin Clausen | thank you! i was misspeaking. there by "relative" i really meant "in-families", a special case of relative. | |
| Mar 25, 2010 at 1:25 | comment | added | JBorger | Lest someone else get confused, let me add that there are some relative properties P which are most definitely not the same as flat + fiberwise P. For instance, properness. | |
| Mar 25, 2010 at 1:19 | history | undeleted | Dustin Clausen | ||
| Mar 25, 2010 at 1:18 | history | edited | Dustin Clausen | CC BY-SA 2.5 |
added 1640 characters in body
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| Mar 25, 2010 at 0:12 | history | deleted | Dustin Clausen | ||
| Mar 25, 2010 at 0:11 | history | answered | Dustin Clausen | CC BY-SA 2.5 |