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Martin Sleziak
Martin Sleziak
9:02 AM
specific-question This recently bumped question has no top-level tag - however I am not sure which of the five tags could be omitted to replace with a top-level tag: Categories which are not compactly generated
12
Q: Categories which are not compactly generated

David Ben-ZviDo you know natural examples of triangulated categories (or [presentable] stable $\infty$-categories) which are not compactly generated? (ideally they'd be defined algebraically, but curious to hear any examples.. the ones I know are gotten as opposites of compactly generated categories or by sli...

infinity-categories homotopy-theory triangulated-categories model-categories derived-categories
 
 
2 hours later…
Martin Sleziak
Martin Sleziak
10:33 AM
As I've mentioned before, it would be relatively easy to prevent users from adding the deprecated tags in new questions: chat.stackexchange.com/transcript/10243/2018/8/28 (The old ones would have to be dealt with manually, but that seems to be a rather long-term project.)
@MartinSleziak S. Carnahan has retagged the question.
 
S. Carnahan
S. Carnahan
11:13 AM
@MartinSleziak The stackexchange people seem to frown on blacklisting, for reasons that I don't quite understand. They seem to suggest that it is a time-consuming process on their end, but the other reasons they cite are rather unclear.
 
Martin Sleziak
Martin Sleziak
@S.Carnahan That seems surprising to me. As you can see here, on Mathematics site there are several blacklisted site: Which are blacklisted tags and blacklisted phrases?
At first I thought that it is a typo and you wanted to write MathOverflow people rather than Stack Exchange people, that would correlate a bit more with my experience. (Although mods are more in contact with the overlords.)
I'll have to go AFK for a bit, but I'll be back - I wanted to ask you something about your answer on main.
 
S. Carnahan
S. Carnahan
@MartinSleziak I am just going on what I read on meta.SE - it is possible that they just don't want to be flooded with requests. I have no problem with blacklisting some tags.
 
Martin Sleziak
Martin Sleziak
12:11 PM
Also there are two different things - burnination and blacklisting.
@S.Carnahan Since you are already he in chat, maybe I can mention this here rather than posting a comment on main.
I have noticed a dead link in your answer to the question you recently bumped (although maybe it is just temporary thing).
2
A: Has anything precise been written about the Fukaya category and Lagrangian skeletons?

S. CarnahanI asked Paul a couple months ago, and he said that nothing has been written, but there may be notes floating around from some talks Kontsevich gave in France last March. There are a few examples given in the last talk at Talbot on the bottom of this page. I was unable to work out a precise math...

The link math.mit.edu/conferences/talbot/wiki/index.php/Main_Page returns for me "Sorry! This site is experiencing technical difficulties."
Just to explain why I thought that MO-mods do not like blacklisting - this is what I was told here in chat:
May 17 '17 at 12:57, by François G. Dorais
@MartinSleziak we hardly ever blacklist tags. We do blacklist other things but not tags. "completeness" and "untagged" are the only two.
 
 
4 hours later…
Martin Sleziak
Martin Sleziak
3:54 PM
And here is a working link for 2009 Workshop math.mit.edu/conferences/talbot/… - although I only see there link to one pdf with notes. (The version in Wayback Machine had two links.)
 
 
1 hour later…
Martin Sleziak
Martin Sleziak
4:54 PM
14
Q: The existing deprecated tags should be blacklisted

Martin SleziakTL;DR: I suggest to blacklist the deprecated tags that still exist on some questions, in order to prevent them from being added to new questions. There are a few tags which are deprecated and should not be used at all, but still exist on the site.1 Ideally such tags should be completely removed,...

discussion tags blacklisted-tags
Since I have mentioned this proposal, perhaps I should add more details. (Although I think most of this is mentioned in my post or in the links given there.)
On the sites which I frequent, I have so far not seen this situation - that a tag is blacklisted, but it still exists.
The tags blacklisted on Mathematics - which I mentioned as examples - have all been blacklisted only after complete removal: Which are blacklisted tags and blacklisted phrases?
Asaf Karagila later asked this on Mathematics Meta: Can we please have a “deprecated tag” feature? When I was searching for previous similar discussions, I found out (to my surprise) that the tag can be blacklisted even without being removed.
To confirm, I have asked this question on Meta Stack Exchange: When a tag is blacklisted, are also all occurrences removed?
I was pointed to this FAQ item: What is a blacklisted tag?
I quote from the answer:
> Why am I being prompted to remove a tag from a question I'm editing?
> Blacklisting, by itself, does not automatically remove the tag from questions using it before it was blacklisted. However, if you edit a question that currently uses a blacklisted tag, you will be prompted to remove it before you can submit your edit.
And there is also this comment by a rather experienced user:
Blacklisted tags are not automatically removed. It only prevents further questions using it, as well as preventing questions already using it from being edited without removing the tag. Sometimes we also purge a tag in the process of blacklisting it, but not always. — animuson ♦ Apr 24 '17 at 23:15
 

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