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Martin Sleziak

4:13 AM

Q: What are morphisms between regularity structures?

In Hairer's notes A Theory of Regularity Structures he defines automorphisms of a regularity structure on page 28. I will recall the definition here: Is there any way of extending this to morphisms between different regularity structures? For example, one would probably want the polynomial reg...

3 hours later…

Martin Sleziak

7:16 AM

specific-question It seems that my edit on the question Guidelines to prove that $2^{\sqrt{2}}$ is a transcendental number? (to remove a deprecated tag) lead to a meta post: Restriction on editing closed questions.

Q: Restriction on editing closed questions

Guidelines to prove that $2^{\sqrt{2}}$ is a transcendental number? question bumped into https://mathoverflow.net/ after making an edit. I am not sure if that adds anything to the question. Should there be restriction on who edits a closed question? Even though if it is just tags. How about re...

discussion editing

Maybe I should add to this specific situation that my edit to this question was mainly to remove (abstract-algebra) tag. This is one of the deprecated tags and AFAICT there is an ongoing community effort to remove those tags and replace them with more suitable ones. In this case (abstract-algebra) was the only tag on the question. A recommendation from a moderator was to retag questions which do not have other suitable tags first. — Martin Sleziak 2 mins ago

Aug 9 '17 at 1:34, by François G. Dorais

For abstract-algebra, I think it's a good idea to first retag all the questions that don't have any of the obvious replacements: ra.rings-and-algebras, ac.commutative-algebra, gr.group-theory. That leaves a little over 200 questions...

3 hours later…

Martin Sleziak

10:26 AM

I should say that now I have some trouble with my internet connection, but I hope I will be able to access chat (at least to some limited extent).

@MartinSleziak how does it make any difference for closed questions... — Praphulla Koushik 50 mins ago

Well, it does not matter whether the question is closed or not, if a tag is supposed to be removed, it has to be removed from all questions.

It is true that diamond-bearing users might have other methods for removal of tags - even without bumping. I mean burnintation and merging. But they can be used only in some situations. As a moderator said here in chat: "Nothing beats manual retagging."

Jun 16 '17 at 18:14, by François G. Dorais

Nothing beats manual retagging, but it's good to avoid excessive bumps. If there were more retagging enthusiasts, we could have a retagging spree for a few days and get rid of stubborn bad tags.

2 hours later…

Martin Sleziak

12:05 PM

I think that blacklisting the deprecated tags should at least partially solve the problem: The existing deprecated tags should be blacklisted. We would be sure that those tags do not appear in new questions and the existence in old questions would be less of a problem.

Considering that the speed of the removal of deprecated tags is about 10 questions per month or perhaps a bit faster, this might take quite a long time.

At the moment there are 891 questions with the deprecated tags. Although most likely not all of them will need to be retagged - at some point the remaining instances of those tags will most likely be burninated or merged.

For example, there are currently 103 questions tagged abstract-algebra with no top-level tag. I hoped to get this number down to 100 - that's why my several recent edits were retags of questions having this tag. It seems that choosing a closed question was a mistake. (Although as I wrote in my answer on meta, I still think that if the question stays on MO - even closed - it is better if it is correctly tagged.)

I will mention once again that there are several users on this site that help with removal of the deprecated tags: chat.stackexchange.com/transcript/message/44938414#44938414. Although the examples linked there are mostly tag edits to recent questions.

3 hours later…

Martin Sleziak

3:45 PM

BTW, on the timeline of that question I see that it already got two delete votes.

> today votes daily summary N/A Up: 0 Down: 2 Delete: 2

3 hours later…

Martin Sleziak

6:46 PM

New tags vinogradov-bracket, nambu-bracket and homotopy-algebra.

Q: Nambu Vinogradov bracket

Has there been any work on homotopy Nambu brackets or even better on strong homotopy Nambu brackets?? Ordinary Nambu brackets appear most recently in work of Takhtajan.