26

I agree that text formatting should be accomplished with Markdown if at all possible. Since Markdown is used across Stack Exchange, there will generally be better support for proper rendering across browsers, mobile devices, screen readers and other accessibility tools, and better compatibility with future systems. MathJax, by its nature and because it is ...

18

Currently, KaTeX supports a limited subset of the functionality provided by MathJax. Many of the missing functionality (notably arrays and equation alignment) is regularly used on MathOverflow, so I would not recommend using KaTeX for viewing MathOverflow.
http://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX
http://docs.mathjax.org/en/latest/tex.html#...

15

I have enabled mathjax on the meta site. Sorry that was a slight oversight on my part.

14

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: https://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.
The secret is invisible unicode characters. In answers, you can use entities in which case &...

13

I understand the sentiment to have this blacklist, but I don't think it's really important for MathOverflow to have it. Very few questions have ever had $$ in their titles, and not always for actual displaymath.
Here is an SEDE query to catch all extant questions which have a revision where the title contained $$. Only 10 results pop up, so I'll look at ...

12

It appears that XyJax is developed independently from MathJax. As a result, MathJax will not support nor test XyJax. This makes integration into MathOverflow difficult since we need to have reliable support for new features. We cannot implement such features without a suitable support plan from the XyJax developers.

11

This site uses MathJax to display mathematical formulas. MathJax is an open source Javascript library, so this is an external solution.
Stack Exchange is a MathJax partner and recently donated $20,000 to support MathJax development. SE also tests beta versions of new MathJax releases on the Math.SE site. So while the library itself is independent, SE does ...

10

This had to do with the citation helper script - mostly with how I implemented the integration with the editor.
The fix is being deployed right now.

10

MathJax supports manual numbering using $$\tag{…}$$, as in \eqref{grz} below:
$$\tag{1}\label{grz}\Box(\Box(p\to\Box p)\to p)\to p$$
Cross-references work, too, with \label and \eqref. The tags needn't be numbers:
$$\tag{LR}\Box p\to p\vdash p$$

10

MathJax in chat
You can find some information on MathJax in chat in the following posts from Mathematics meta:
Should chat have TeX support? You can find in an answer a bookmarklet which you can add to your browser and then you can render MathJax in chat: http://www.math.ucla.edu/~robjohn/math/mathjax.html (There are also a few more userscripts in other ...

9

My apologies if this should be a comment rather than answer, but robjohn has a website with some very handy bookmarks to deal with these issues. Obviously it would be preferable if a bookmark bar were not needed, but rendering on and rendering off are quite helpful currently.

8

A couple I have noticed:
using \\, instead of \, splits the line,
using \\; instead of \; splits the line, and
using \\! instead of \! splits the line.
Added later: There have been some instances where people have used \_ instead of _ but I believe all of these have now been fixed. Edit by R. Andrade: Apparently, there are still instances of this issue ...

8

7

You can also introduce new commands only when they are first needed.
Such as $\newcommand{\where}{\text{here}}\where$ or $\where$.
Source:
You can also introduce newcommands only when they are first needed.
Such as $\newcommand{\where}{\text{here}}\where$ or $\where$.

7

As Martin pointed out in the comments, a workable solution is to begin your post with something like:
$\newcommand{\C}{\mathbb{C}}$
$\newcommand{\R}{\mathbb{R}}$
$\newcommand{\norm}[1]{\Vert#1\Vert}$
...........
Perhaps you even want to save a preamble somewhere that you can easily cut and paste in your post.
The problem, of course, is that different ...

7

Fixed in build rev 2013.7.2.799. From this build on special characters between $ signs won't need to be escaped in comments.
However I should note that this breaks some existing comments that escaped special characters:
$p^{\*}$ test $(p^{\*})^2$
The above markup in existing comments renders the same as in posts: $p^{\*}$ test $(p^{\*})^2$, and can be ...

7

MathJax v2.6 was released on Dec 30, close to the OP. These updates can lead to errors if a browser cache contains a mix of MathJax components with different versions. In that case, clearing the browser cache from all things MathJax (and for some browsers, additionally restarting the browser) should help.

7

The user has been contacted by a moderator. Please advise if the behavior persists.

6

At this point there is no MathJax support in the chat system, but this meta.MSE thread includes some information on how to overcome this issue.

6

An alternative is to use Benoit Schweblin's StackEdit. While StackEdit is designed for much more than just editing your MathOverflow posts, it supports essentially the same markdown+MathJax flavor as MathOverflow.

6

I have finished a global update on posts that contain \\{ and \\} and rebaked all of these posts.
Please let me know if there are any other issues.

6

Here is one possible way to draw your diagram.
The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an detour.
$\require{AMScd}$
\begin{CD}
7 @= 7 @= 7 @= 7\\
@| @. @. @AyAA\\
7 @. @. 1 @>x>> 2 @>y>>8\\
@VxVV @. @AxAA @VxVV @VyVV\\
6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\
@VyVV @. @. @VyVV @...

6

One could make the argument that someone unfamiliar with LaTeX probably won't have the requisite background to contribute meaningfully in this site. Granted, there are some peculiarities with MathJax.
But aside from that aside, here are a couple of points.
The /help/formatting is fairly standard across the network (I have only seen a different version on ...

6

Like this:
$\begin{eqnarray*} & 682 \\ -&426 \\ \hline \end{eqnarray*}$
$\begin{eqnarray*} & 682 \\ -&426 \\ \hline \end{eqnarray*}$
For general $\LaTeX$ questions see tex.stackexchange.com

6

I think the question is too emotionally laden to present the problem correctly. To me it is like "All the preprints use Knuth's computer modern font. How dare we change that?". The use of the word 'abuse' seems to have already not only judged the action, but tried and convicted it, and sent a summons to the executioner.
A more charitable presentation ...

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