14

Any user with at least 15 reputation points should flag the post as spam. After 6 spam flags, the post is deleted. In addition to being deleted, even for users who can see the deleted posts, the content of the post is hidden - although they can still access the revision history. The same thing happens after a total of 6 flags that are either "spam", or "rude ...

9

There is a built-in system to automatically create tag synonyms by the nomination and voting of high-reputation users. Unfortunately, it appears that hardly anyone ever looks at this page (and the qualifications for voting are fairly demanding), so I'm posting it here to try to get it more attention. In particular, all of the synonyms marked as "pending" ...

7

The tags matrix-analysis (32 questions tagged) and matrix-theory (18 questions) should probably be merged, unless there is a strong difference between them that I am not aware of (incidentally, there is also matrices, 150 questions tagged).
The tag matrix-inverse (6 questions) seems overly specific and in my opinion it should be removed outright.

7

As of August 8, 2017, the length limit for tags went from 25 characters to 35 characters. So now is a great time to allow inconveniently compressed tag names to stretch out a bit...
Perhaps we could collect here list of tags which now, after the character limit for length of tag name has been extended, could be spelled in full instead of a shortening. (This ...

6

I suggest deleting the tag decomposition-theorem.
I would guess that the tag was intended to be about the decomposition theorem of Beilinson-Bernstein-Deligne-Gabber. It seems unnecessary to have a whole tag just dedicated to this theorem (perverse-sheaves should suffice). What's worse, most posts with this tag are just about various "decompositions" in ...

5

This site uses MathJax - which is a library which for displaying mathematics in web browsers. The syntax is basically LaTeX, so if you are already familiar with TeX or LaTeX you should be fine. (It is worth keeping in mind that only stuff that can be used inside math mode works in MathJax too.1)
It is useful to know that you can learn some parts of the ...

4

The tag crystals seems to be used for three completely different meanings: 1) Quantum groups/representation theory/combinatorial crystals 2) Crystals in algebraic geometry/category theory 3) Crystals in physics/condensed matter.
I'm not sure what would be the best way to separate these. Perhaps "crystal-bases" or "crystal-graphs" for 1 ...

4

You can find a very basic introduction to MathJax (LaTeX) syntax in the other answer. Here are links to some further resources that might be useful. (Some of them are not specifically about MathJax, but since MathJax and LaTeX syntax is very similar, they can still help. And they might be also useful if, for some reason, you decide to learn LaTeX.)
MathJax ...

3

Suggesting to make characteristic-p a synonym of positive-characteristic. Both exist with with 232 questions and 82 questions (and only 7 tagged both). The first one has a tag excerpt. In practice, I can't even detect the beginning of a difference between the two.
I believe the second one (positive-characteristic) is slightly better (in principle allowing ...

3

The tags noncommutative-algebra and noncommutative-rings should be merged; the first being more used, and also in analogy with the tag ac.commutative-algebra, I'd suggest to embed noncommutative-rings into noncommutative-algebra.
Making a synonym noncommutative-rings $\to$ noncommutative-algebra would also have the advantage that the latter tag is ...

2

About tag hyperkaehler (13 questions at this date).
a) tautological part: should be changed to hyperkahler, in coherence with the use of tags related to Kähler: kahler-manifolds, kahler-differentials...
b) a bit less important: I think it should even be changed, in coherence with the use of kahler-manifolds, to hyperkahler-manifolds. At least, I've checked ...

2

The tag ft.factorization-theory was created in 2016 by a user who did almost the totality of the 23 questions with it. It is formatted as a top-level tag, while it isn't. Could it be changed to factorization-theory?
This tag has empty tag info, seems to be concerned with the multiplicative monoid in rings and factorization question therein. Although it's ...

1

I suggest invariant-theory and classical-invariant-theory be made synonyms. Don't see the point in making a distinction here.

1

continuity seems to have no coherent use. It has 3 watchers for 88 questions, which is a very low ratio (compared to tags with a comparable number of questions).
It's mostly to mean some use of continuity, often somewhere fitting with real-analysis, gn.general-topology, and others. This number of questions is ridiculously small compared to the number of ...

1

I propose to systematically rename each tag xxx reduced to the name of a software, adding "-software" to make the tag (thus xxx-software) more understandable, and, furthermore, to allow to gather such tags when typing "software".
This applies to sage, gap, magma, coq, etc (this list is not comprehensive; this post is community-wiki hence feel free to ...

1

I propose to make qcqp (10 questions) a synonym of quadratic-programming (34 questions).
quadratic-programming has no usage guidance.
qcqp has: A quadratically constrained quadratic program (QCQP) is an optimization problem in which both the objective function and the constraints are quadratic functions.
The latter could be embedded, possibly improved, ...

1

Done.
The tags locally-presentable-categories and presentable-categories should surely be synonyms. I would personally prefer that the former (much older, well-established, and less ambiguous, terminology) be the tag and the latter the synonym, but either direction of synonym would be better than having two separate tags.

1

I'm not sure if this is the right place to raise the issue, but I don't really like that combinatorial-geometry has been merged with discrete-geometry. In my opinion, this is the same (in a smaller scale) as merging combinatorics into discrete mathematics. There are many problems in discrete-geometry that have nothing to do with combinatorics.

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