The mathematica tag is for questions relating to the Mathematica software. People (typically newcomers) sometimes mistakenly add this tag to questions when they really mean math, not Mathematica. This misunderstanding is very common, and not surprising, given that typing "mat..." causes the autocompletion to suggest mathematica and that "mathematica" is the term used for math in many languages.
I corrected two such misuses of the tag today. (1), (2). This is not a popular tag, currently there are only 68 uses.
We have the same problem with the site name of Mathematica.SE and it's so common that we need to migrate questions to Math.SE daily.
StackOverflow had the same problem with their
mathematica tag and they solved it successfully by renaming it to wolfram-mathematica. (meta)
I propose doing the same on TeX.SE. Rename mathematica to wolfram-mathematica
but keep .
mathematica as a synonym
Link to chat discussion on the topic.
Update: It seems people are in favour of just renaming the tag to
wolfram-mathematica and not having any synonym for it, so I'm modifying the proposal to suggest this solution (i.e. no synonym). If you disagree, please comment.
math.... Is the idea that they will then see that it is a synonym, appreciate what that means and think again?
wolfram-mathematicathat would show up visibly. It's less likely that people would select that by accident or as a misunderstanding.