@ArcticChar

This post math.stackexchange.com/questions/3179063/equation-and-property/… is getting vandalized (edited and deleted/undeleted) by OP and another account probably belonging to OP. I've flagged it for moderation; plz halp :-)

Yikes... That question is a mess!

It looks like revision 13 is the most recent reasonable version?

@saad : So? It is never a must to post on meta first when one wish to add a new tag. Simple math. Just go count the number of tags discussed on meta and the number of existing tags. There is never such a practice. So I am asking you again: Why do you think that semi-simple Lie algebras is a bad tag and should be deleted right away?

@XanderHenderson That's correct. But that was a rollback of another rollback... :/

@ArcticChar The culture of Math SE is that new tags should not be created without discussion. Personally, I don't see a strong reason against a semi-simple Lie algebra tag, though I also don't see a terrible strong argument in favor, either. Make the case on meta. My guess is that you will find plenty of support there.

It should also be noted that many of the tags on MSE are from the early days---they were imported from Math Overflow, and/or created before the current cultural norms were established, hence the idea of comparing to the number of tags to the number of discussions of tags seems like a red herring.

@ArcticChar A bit related: Should every new tag be discussed on meta before creation? Several of the questions linked there are related discussion.

Of course, various users has various views on creating new tags. In short, the tag system as a whole (and also new tags) - it's quite a mess.

There is indeed no such culture, @XanderHenderson. See the meta posted by Martin, especially the answer. Indeed there are new tags coming up almost everyday, it is not realistic to have every new tags discussed. For some specific subject, it is even meaningless to post on meta since it is too advanced/localized. In particular, it is now Saad who has strong opinion against the tags (e.g. I did not retag the tag back after they edit it away)..

so it should be them explaining why this tag should not exist.

@MartinSleziak, yes it is, but (1) SE won't change the system anyway, and (2) if one consider only more advanced subject, there are still 1-2 users in quite some fields doing daily cleanup. So I would say more advanced subject, the tag systems is still working okay.

And he is strongly against many tags: chat.stackexchange.com/transcript/message/49838909#49838909

@Andrews Just to be clear, by strongly against I mean they edited away the tags repeatedly, after more than one users added the tags in different questions and differential time.

@ArcticChar You bring up one meta post from four years ago. In reply, I would suggest that you look at the tagging and tag-management tags on meta. There is a desire among many users to see new tags get discussed, and I am fairly sure that I recall at least one moderator suggesting that he would delete new tags which had not been discussed.

As I said, there is a cultural norm of asking before tagging. This does not mean that it is a uniform culture, nor does it mean that there are none who violate the norm

@Andrews Thank you for posting that. I upvoted it---I'm not sure that it is needed, but (like I said earlier) I have no strong objection, and can't see how it causes any harm.

@XanderHenderson To be fair, it was me who mentioned that post. So Arctic Char is not the person to blame for that.

@MartinSleziak No worries. It likely doesn't matter all that much, one way or t'other. I suspect that the tag will get support, which is what really matters.

@ArcticChar That's even worse and unacceptable when tag semisimple-lie-algebras already had usage and tag wiki that time (actually I did that).

@Andrews Exactly for the reason that the tag (might) possibly be created again, I saved link to the tag-info: chat.stackexchange.com/transcript/message/49840750#49840750

In any case, some tags might be removed despite having tag-info. (If you follow discussions around tags, you have probably seen several of them.)

I would agree that the thread is a bit old, @XanderHenderson but I really don't see this as culture whatsoever (not a culture of MSE). And the answer-er of the post that I or Martin linked is again one of the most respectable ex-moderator...