The set-theory tag is explicitly about mathematics (and metamathematics) in the context of $\mathsf{ZFC}$ and its subsystems and extensions.
Every now and then we see questions about other set theories ($\mathsf{NF}$ is popular enough, but there are other versions, see here, for instance).
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Andrés E. Caicedo (and @AsafKaragila). I'd say that discussion so far indicates that prevalent opinion is in favor of new tag, but there is not much feedback on what to include. Would you be willing to write an answer with suggestion of possible tag-wiki - this would make the proposal of new tag more specific and also give a place for others to comment if they have suggestions what to include in the tag-info. (I think it is reasonable to do this while the post is less than 14 days old and it is still shown in the community bulletin.) — Martin Sleziak32 secs ago
So far the reaction seems to be mostly in favor of the new tag, but it would be good to clarify the scope of the tag a bit more.
Proposal to rename quadratic-equation to (quadratic-equations)
Reason: Mathematical objects in tag names have plural forms, say cubic-equations, quadratic-forms, polynomials, etc
Proposal to pluralize reproducing-kernel-hilbert-space and to make "rkhs" a synonym of "reproducing-kernel-hilbert-spaces"
Reason:
Idem to my previous proposal: we have hilbert-spaces.
RKHS is a widely-accepted acronym for reproducing-kernel-hilbert-space.
Short acronyms are good for tag names...
Proposal to rename quadratic-equation to (quadratic-equations)
Reason: Mathematical objects in tag names have plural forms, say cubic-equations, quadratic-forms, polynomials, etc
