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At the following link in the MathJax documentation it lists the supported LaTeX symbols alphabetically that it supports, followed by the set of supported environments...

http://www.mathjax.org/docs/2.0/tex.html#symbols

My question is where are each of these symbols/enviornments described and documented?

For example, where is the definitive description of the \above symbol ?

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    Is the focus here MathJax or the more general syntax for math mode commands for (La)TeX? The latter is on-topic, but MathJax-specifics are off-topic as MathJax does not actually use TeX, only LaTeX-like math commands.
    – Joseph Wright ♦
    Mar 25, 2012 at 9:13
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    The commands and their usage are explained in detail in this page that is linked to the page you mentioned.
    – egreg
    Mar 25, 2012 at 9:16
  • The advantage of just typing TeX equations in html that MathJax provides is so awesome that it never occurred to me that this might be off-topic. I assumed that the original question was aimed at extending MathJax support for LaTeX. I think egreg's answer was more appropriate.
    – Scott Prahl
    Mar 25, 2012 at 20:17
  • @JosephWright: Sorry Joseph I disagree. The LaTeX-like features of MathJax are most certainly a TeX-related tool, and as such are on topic at tex.stackexchange.com, as per point 4 of FAQ.
    – Andrew Tomazos
    Mar 25, 2012 at 20:40
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    the link in the question is dead, 404
    – Dee
    Oct 6, 2019 at 8:23

2 Answers 2

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The Web page

http://www.onemathematicalcat.org/MathJaxDocumentation/TeXSyntax.htm

has a very detailed explanation of each LaTeX command that is interpreted by MathJax.

The commands are of course explained in the LaTeX manual or in many user's guide; the commands that are labeled "AMS" are described in the documentation of amsmath.

A particularly recommended guide about math in LaTeX is "Math mode" by Herbert Voß (although more focused on usage in LaTeX).

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The definitive answers are in the JavaScript source code. The best way to examine the source is to download the source from GitHub 

git clone http://github.com/mathjax/MathJax

Once you have the source files, then it is possible to see exactly how \above is implemented and you'll find that \above is defined in unpacked/jax/input/TeX/jax.js as 'Over', which in turn is implemented using the following JavaScript

Over: function (name,open,close) {
  var mml = STACKITEM.over().With({name: name});
  if (open || close) {
    mml.open = open; mml.close = close;
  } else if (name.match(/withdelims$/)) {
    mml.open  = this.GetDelimiter(name);
    mml.close = this.GetDelimiter(name);
  }
  if (name.match(/^\\above/)) {mml.thickness = this.GetDimen(name)}
  else if (name.match(/^\\atop/) || open || close) {mml.thickness = 0}
  this.Push(mml);
},

which is pretty inscrutable. Simpler TeX constructs like \alpha are simply mapped to the corresponding unicode value

alpha:        '03B1',
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