Timeline for Epimorphisms and 2-isomorphic maps to an algebraic stack
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Oct 7, 2023 at 0:02 | history | edited | LSpice | CC BY-SA 4.0 |
Clean-up, while this is on the front page
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| Oct 6, 2023 at 23:46 | answer | added | mhahthhh | timeline score: 1 | |
| Dec 16, 2016 at 23:57 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Nov 16, 2016 at 23:19 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Oct 17, 2016 at 22:56 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Sep 17, 2016 at 21:40 | answer | added | HeinrichD | timeline score: 1 | |
| Sep 17, 2016 at 20:06 | history | edited | stupid_question_bot | CC BY-SA 3.0 |
added 126 characters in body
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| Sep 5, 2016 at 21:21 | history | edited | stupid_question_bot | CC BY-SA 3.0 |
added 6 characters in body
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| Aug 11, 2016 at 22:26 | comment | added | David Roberts♦ | Sorry, then I'm out of ideas. | |
| Aug 11, 2016 at 17:17 | comment | added | stupid_question_bot | @DavidRoberts So, according to nlab, in a category with pullbacks, (eg, the category of schemes), regular epimorphisms are the same as effective epimorphisms, and iirc finite etale morphisms are effective epi's, but the statement is definitely false for finite etale (ie, separable) extensions of fields. | |
| Aug 11, 2016 at 5:41 | comment | added | David Roberts♦ | Hmm, maybe I was too quick. I think you need Spec(L) --> Spec(K) to be a regular epimorphism, hence K --> L to be an effective monomorphism. I'm not sure about such things in algebra... | |
| Aug 10, 2016 at 23:48 | comment | added | stupid_question_bot | @DavidRoberts Can you elaborate on what you mean by coherence conditions? | |
| Aug 10, 2016 at 22:32 | comment | added | David Roberts♦ | You need extra conditions on your 2-arrow, namely coherence conditions, for it to descend. | |
| Aug 10, 2016 at 21:05 | history | asked | stupid_question_bot | CC BY-SA 3.0 |