Timeline for What are the monomorphisms in the category of schemes?
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9 events
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| Apr 13, 2017 at 12:58 | history | edited | CommunityBot |
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| Jan 17, 2016 at 16:02 | comment | added | Martin Brandenburg | Let me mention that one can describe $X \times_Y X$ as a locally ringed space explicitly (see arxiv.org/pdf/1103.2139v1.pdf for instance) and this gives a very explicit description of monomorphisms (using the condition that $X \to X \times_Y X$ is an isomorphism). But I haven't seen it in practice so far. | |
| Jul 6, 2012 at 9:33 | history | edited | Martin Brandenburg | CC BY-SA 3.0 |
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| Feb 25, 2011 at 16:28 | vote | accept | Phillip Williams | ||
| Feb 25, 2011 at 8:23 | history | edited | Martin Brandenburg | CC BY-SA 2.5 |
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| Feb 25, 2011 at 8:16 | comment | added | Lorenzo | Nice and complete answer! I particularly like the criterion (2). I add an example parallel to the last one: In EGA IV, 17.9.1 it's proved that the étale monomorphisms are exactly the open immersions. | |
| Feb 25, 2011 at 7:59 | history | edited | Martin Brandenburg | CC BY-SA 2.5 |
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| Feb 25, 2011 at 7:52 | history | edited | Martin Brandenburg | CC BY-SA 2.5 |
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| Feb 25, 2011 at 7:47 | history | answered | Martin Brandenburg | CC BY-SA 2.5 |