Timeline for What are the occurrences of stacks outside algebraic geometry, differential geometry, and general topology?
Current License: CC BY-SA 4.0
27 events
when toggle format | what | by | license | comment | |
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Aug 3, 2020 at 9:34 | history | edited | Praphulla Koushik | CC BY-SA 4.0 |
added 83 characters in body
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Jun 4, 2020 at 17:40 | answer | added | Toby Bartels | timeline score: 8 | |
Jun 1, 2020 at 21:19 | answer | added | Simon Henry | timeline score: 8 | |
Jun 1, 2020 at 2:43 | comment | added | Praphulla Koushik | @DmitriPavlov ok :) | |
Jun 1, 2020 at 2:42 | comment | added | Praphulla Koushik | @DavidRoberts Ok. Thanks.. :) | |
Jun 1, 2020 at 2:13 | comment | added | David Roberts♦ | @PraphullaKoushik ncatlab.org/nlab/show/classifying+topos+of+a+localic+groupoid | |
May 31, 2020 at 20:43 | comment | added | Dmitri Pavlov | @PraphullaKoushik: The first time in the answer by Francois Ziegler that has been deleted for this reason. The second time in the answer by Qfwfq. | |
May 31, 2020 at 20:22 | comment | added | Praphulla Koushik | @DmitriPavlov thanks for the edit., it looks better.. twice?? Where? | |
May 31, 2020 at 20:01 | comment | added | Dmitri Pavlov | Considering that bundle gerbes have already been mentioned twice despite being excluded in the second example, I edited the main post to make it more clear that it asks for examples outside of the three listed areas. | |
May 31, 2020 at 20:01 | history | edited | Dmitri Pavlov | CC BY-SA 4.0 |
Adjusted the phrasing to make it clear that the 3 examples in the main post are excluded.
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May 31, 2020 at 19:12 | answer | added | Nicolas Hemelsoet | timeline score: 11 | |
May 31, 2020 at 18:51 | answer | added | Qfwfq | timeline score: 2 | |
May 31, 2020 at 18:41 | comment | added | Praphulla Koushik | @SimonHenry I am hearing them for the first time.. Any answer with 1 or more references would be welcome :) | |
May 31, 2020 at 18:33 | comment | added | Simon Henry | A big results of topos theory is the (2,1)-category of Grothendieck toposes identifies with a reflective full subcategory of the category of "localic stacks" (stacks over the category of locales, where the covers are open surjection). But, that's not very far off topological stacks, so I'm not sure this count. This was mostly formulated in the language of localic groupoids however, but this is completely equivalent, and stacks make the theory more natural. | |
May 31, 2020 at 18:27 | comment | added | xuq01 | Stack semantics in categorical semantics, no? | |
May 31, 2020 at 17:47 | answer | added | Ben Wieland | timeline score: 7 | |
May 31, 2020 at 1:16 | history | became hot network question | |||
May 31, 2020 at 1:09 | comment | added | Praphulla Koushik | @MoisheKohan thanks for the comment.. can you please make it as an answer adding some more information.. Yes, I also heard of orbifolds as “proper étale Lie groupoids”.. | |
May 30, 2020 at 22:10 | answer | added | Dmitri Pavlov | timeline score: 19 | |
May 30, 2020 at 21:58 | answer | added | Dmitri Pavlov | timeline score: 16 | |
May 30, 2020 at 20:48 | comment | added | Moishe Kohan | The entire chapter of the book by Bridson and Haefliger is about nonpositively curved complexes of groups which are stacks in the category of simplicial complexes. Orbifolds are widely used in low dimensional topology. | |
May 30, 2020 at 17:27 | comment | added | Praphulla Koushik | @LSpice It is not a typo.. It associates to each object a collection of collection of arrows... :D each collection in that collection is called a cover of $U$.. Thanks for other corrections.. | |
May 30, 2020 at 17:24 | comment | added | LSpice | I did some proofreading, hopefully without changing any meanings. Is it really true that $\mathcal J_U$ is a collection of collections of arrows, or is one of those layers a typo? | |
May 30, 2020 at 17:24 | history | edited | LSpice | CC BY-SA 4.0 |
Proofreading and names of papers
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May 30, 2020 at 17:19 | comment | added | Praphulla Koushik | There would be of course more articles on topological stacks than what I have mentioned above.. Please let me know if you come across any other.. It is just that I have come across only four.. But, I am sure the number would be much less when compared to articles dealing with algebraic stacks.. | |
May 30, 2020 at 17:16 | review | Suggested edits | |||
May 30, 2020 at 17:16 | |||||
May 30, 2020 at 17:14 | history | asked | Praphulla Koushik | CC BY-SA 4.0 |