Timeline for What are some nice uses of ultraproducts/ultrapowers?
Current License: CC BY-SA 4.0
22 events
| when toggle format | what | by | license | comment | |
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| Dec 26, 2023 at 20:18 | history | edited | Joel David Hamkins |
edited tags
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| Aug 7, 2023 at 13:21 | history | made wiki | Post Made Community Wiki by David Roberts♦ | ||
| Jul 22, 2023 at 23:59 | answer | added | Tom Leinster | timeline score: 6 | |
| Jul 21, 2023 at 14:03 | comment | added | Noah Schweber | @H.CManu Not even a little. :P | |
| Jul 21, 2023 at 11:10 | comment | added | H.C Manu | @NoahSchweber your question is quite in line with what I had in mind regarding applications of them to computability but it is a bit over my head for now haha. Have you made some progress towards an answer? | |
| Jul 21, 2023 at 10:01 | history | edited | Martin Sleziak |
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| Jul 21, 2023 at 9:45 | answer | added | Asaf Karagila♦ | timeline score: 26 | |
| S Jul 21, 2023 at 5:19 | history | suggested | postylem | CC BY-SA 4.0 |
fixed a typo
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| Jul 21, 2023 at 4:12 | review | Suggested edits | |||
| S Jul 21, 2023 at 5:19 | |||||
| Jul 20, 2023 at 18:27 | comment | added | Yemon Choi | Operator algebras. | |
| Jul 20, 2023 at 17:42 | comment | added | D.R. | Terry Tao has written/lectured about their role in relation to many of his areas of research (analysis, combinatorics, etc.): see terrytao.wordpress.com/2013/12/07/…, and the links therein, in particular terrytao.wordpress.com/2011/10/15/…, youtube.com/watch?v=IS9fsr3yGLE&ab_channel=SimonsInstitute | |
| Jul 20, 2023 at 17:18 | history | became hot network question | |||
| Jul 20, 2023 at 14:21 | answer | added | Neil Strickland | timeline score: 11 | |
| Jul 20, 2023 at 14:00 | answer | added | Gabe Conant | timeline score: 13 | |
| Jul 20, 2023 at 13:39 | answer | added | Noah Schweber | timeline score: 10 | |
| Jul 20, 2023 at 13:36 | comment | added | Noah Schweber | Not an answer, but you may be interested in this question of mine: mathoverflow.net/questions/404290/… | |
| Jul 20, 2023 at 12:03 | answer | added | Joel David Hamkins | timeline score: 21 | |
| Jul 20, 2023 at 11:17 | review | Close votes | |||
| Jul 20, 2023 at 14:40 | |||||
| Jul 20, 2023 at 10:38 | comment | added | Joseph Van Name | The Ax-Grothendieck theorem states that every injective polynomial $f:\mathbb{C}^n\rightarrow\mathbb{C}^n$ is surjective. The proof amounts to factorizing the field $\mathbb{C}$ as an ultraproduct of the algebraic closures of finite fields. The result holds for finite fields and hence their algebraic closures and ultraproducts. | |
| Jul 20, 2023 at 10:35 | history | edited | J.J. Green | CC BY-SA 4.0 |
minoor typos
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| Jul 20, 2023 at 9:26 | comment | added | Mikhail Katz | You may want to check out the tag mathoverflow.net/questions/tagged/ultrafilters | |
| Jul 20, 2023 at 9:17 | history | asked | H.C Manu | CC BY-SA 4.0 |