Re: Inequalities in math blocks

[Max Nikulin]

On 03/10/2021 18:04, Rudolf Adamkovič wrote:
> The following Org markup does not render properly in HTML export:
>
> - foo $a<b$ bar foo $b>a$ bar
> In Emacs, I see no signs of problems, such as broken math highlighting. 
> Further, when I export to LaTeX, the inequalities render properly. Does 
> one have to use \lt and \gt instead of < and
> > all the time? If so, why allow < and > characters in math 
> blocks? I ask because, when I reorganize my Org document, it breaks math 
> "at random" when I use < and > and Emacs does not tell me about it.

I had another reason to look into the manual today, so I noticed:

https://orgmode.org/manual/Math-formatting-in-HTML-export.html

> (131)
>
> Please note that exported formulas are part of an HTML document, and
> that signs such as ‘<’, ‘>’, or ‘&’ have special meanings. See MathJax
> TeX and LaTeX support.

The link is broken however.

http://docs.mathjax.org/en/latest/input/tex/html.html#html-special-characters

> Usually, it is sufficient simply to put spaces around these symbols to
> cause the browser to avoid them, so
>
> ... when $x < y$ we have ...

Though I am a bit surprised that Org did not replace characters to &lt; 
and &gt; during export. Perhaps, it is possible to define a filter.