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From: nobody@nowhere.invalid (Marc Olschok)
Newsgroups: comp.text.tex
Subject: Re: How to read Web pages with funny backslashes?
Date: Wed, 31 Jul 2024 22:33:21 -0000 (UTC)
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On Wed, 31 Jul 2024 15:56:47 Stefan Ram wrote:
> ram@zedat.fu-berlin.de (Stefan Ram) wrote or quoted:
>>|\[ \eta_{\mu\nu}=\begin{pmatrix}-1&0&0&0\\0&1&0&0\\0&0&1&0 . . .
> 
>   Now I see that it seems to be required to activate JavaScript
>   in the browser as the source code of the HTML web page is:
> 
> |<p><script type="text/x-mathjax-config"> 
> |  MathJax.Hub.Config({ 
> |    extensions: ["tex2jax.js"], 
> |    jax: ["input/TeX","output/HTML-css"], 
> |    tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]} 
> |  }); 
> |</script> 
> |<script type="text/javascript" src="/mathjax/MathJax.js"></script> 
> |
> |Here's something that caused me undue confusion over the
> |years as I was learning about tensors.</p>
> |
> |<p>Many textbooks, for instance, will tell you that the
> |metric tensor of special relativity takes a form like</p>
> |
> |<p>\[
> |\eta_{\mu\nu}=\begin{pmatrix}-1&0&0&0\\0&1&0 . . .
> |\]</p>
> 
>   . Still, it would be interesting if anyone could comment
>   on what "dialect" of TeX/LaTeX is used there and how one
>   could format it using an implementation of TeX or LaTeX!

It is ordinary LaTeX inside the \[ ... \] marks (if you happen to use
math.stackechange or mathoverflow ore the nlab etc. you probably have
already seen this). The strange thing is that the & inside the matrix
are replaced by the & , so they will display as & but of course not
compile. I do not know if this is meant to be this way or an error on
the web page.

-- 
M.O.