Timeline for What are examples of mathematical objects that are 'constructed out of' a range of other objects but fall out of them? [closed]
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| May 14, 2021 at 22:18 | history | closed |
Gro-Tsen Wojowu Joseph Van Name R. van Dobben de Bruyn Sam Hopkins |
Needs details or clarity | |
| May 14, 2021 at 20:09 | comment | added | Steve Huntsman | Modular curves are often (but not always) curves of genus $\ne 1$. | |
| May 14, 2021 at 19:05 | review | Close votes | |||
| May 14, 2021 at 22:27 | |||||
| May 14, 2021 at 18:59 | history | made wiki | Post Made Community Wiki by Stefan Kohl♦ | ||
| May 14, 2021 at 18:59 | comment | added | Wojowu | I think $\omega^2$ should be built out of $\omega i+j$ for $i,j$ natural. | |
| May 14, 2021 at 18:57 | comment | added | R. van Dobben de Bruyn | There are a lot of categories whose objects are colimits of small objects. For example, any set is a filtered colimit of finite sets, any commutative ring is a filtered colimit of finitely presented commutative rings, any module over a ring is a colimit of finitely presented modules, etcetera. The keyword is accessible categories. | |
| May 14, 2021 at 18:53 | comment | added | Steven Stadnicki | The whole notion of 'completion' (of a topological space, etc.) is to expand the range by this sort of process. | |
| May 14, 2021 at 18:48 | answer | added | Pace Nielsen | timeline score: 1 | |
| May 14, 2021 at 18:35 | history | edited | qk11 | CC BY-SA 4.0 |
added 1 character in body
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| May 14, 2021 at 18:29 | history | asked | qk11 | CC BY-SA 4.0 |