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Help of the Cross Validated says that "Cross Validated uses MathJax to render LaTeX." and the "Learn more" link leads to this site, where (under the Matrices point) you can find an example for bordermatrix, so I thought it means that it is supported. Yet, it doesn't seem to work, even if I directly copy the example there, it gives an error (misplaced &):

$$\bordermatrix{\text{corner}&c_1&c_2&\ldots &c_n\cr r_1&a_{11} & 0 & \ldots & a_{1n}\cr r_2& 0 & a_{22} & \ldots & a_{2n}\cr r_3& \vdots & \vdots & \ddots & \vdots\cr r_4& 0 & 0 &\ldots & a_{nn}}$$

  • I'd advise to to consult this mathjax tutorial. MathJax is not equivalent to LaTeX, though it is largely based on LaTeX. You can also search math.meta.stackexchange.com for questions asked about mathjax. If you can't find anything resembling what you want to do, you can ask on that site for suggestions of how to do so using mathjax. – Namaste Jun 30 at 19:37
  • @JedrekMansfield Thanks! I checked it, I don't seem to be able to find bordermatrix there. Is it some kind of an official reference? I mean, does the lack of bordermatrix in that list officially means that is it unsupported...? (Contrary to the link provided under Help!) – Tamas Ferenci Jun 30 at 19:40
  • The link you are given is to a more exhaustive format, TeX. There are work-arounds in mathjax, but MathJax does not support all that TeX nor all that LaTeX supports. There is an SE site dedicated to TeX and LaTeX. You might want to ask there, but I'm not sure how much they deal with MathJax. – Namaste Jun 30 at 19:43
  • Thanks! You are right. In that case it is somewhat misleading that this site is referred by the Help, what you linked would be much more helpful! – Tamas Ferenci Jun 30 at 19:47
  • And I think I also found the "official" answer: github.com/mathjax/MathJax/issues/2031 ... – Tamas Ferenci Jun 30 at 19:47
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As per the official site of MathJax, it indeed seems to be unsupported. This is discussed on several Stack Exchange sites as well, with workarounds (see this or this or this).

So there are two issues here, a feature request, but it is already done in the linked places, and a different problem, namely that Cross Validated's help refers to a generic TeX page, instead of a MathJax page, which is not really fortunate as they're far from being equivalent. More then that, it is also quite misleading, as the link's caption literally says: "Learn more: MathJax help" (and leads to a TeX site!).

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