Re: Latex export with \begin{equation}

[Dominik Schrempf <dominik.schrempf@gmail.com>]

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Oh thanks,

I thought it would be good to add a comment to the Org mode manual although it
is of course not really Org mode related.

I decided that a good location would be
https://orgmode.org/manual/Math-formatting-in-HTML-export.html#Math-formatting-in-HTML-export

A proposed patch is attached, please let me know what you think.

Best,
Dominik


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--- org-manual.org	2018-09-17 18:48:17.868785307 +0200
+++ org-manual.org.new	2018-09-17 18:48:09.708751068 +0200
@@ -12655,7 +12655,9 @@
 #+vindex: org-html-mathjax-template
 See the docstring of ~org-html-mathjax-options~ for all supported
 variables.  The MathJax template can be configure via
-~org-html-mathjax-template~.
+~org-html-mathjax-template~.  Please note that formulas will be part
+of an HTML document, and that signs such as =<=, =>=, or =&= have
+special meanings (see [[http://docs.mathjax.org/en/latest/tex.html#tex-and-latex-in-html-documents][MathJax TeX and LaTeX support]]).
 
 If you prefer, you can also request that LaTeX fragments are processed
 into small images that will be inserted into the browser page.  Before

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Nick Dokos <ndokos@gmail.com> writes:

> Dominik Schrempf <dominik.schrempf@gmail.com> writes:
>
>
>> so I found the reason. Both Org versions behave the same, sorry for the
>> confusion. The original equation that does not get exported correctly 
>> contained
>> angles:
>>
>> \begin{equation}
>>  <k_{eff}> = \frac{\sum_i w_i k_{eff}(i)}{\sum_i w_i}.
>> \end{equation}
>>
>> This equation is correctly rendered when using a .tex file and native LaTeX.
>> If the angles are removed, the Org Mode HTML export works:
>>
>> \begin{equation}
>>  k_{eff} = \frac{\sum_i w_i k_{eff}(i)}{\sum_i w_i}.
>> \end{equation}
>>
>> Does anybody know why? Is this expected behavior? Can this be changed?
>>
>
> Maybe this explains it:
>
> "...Also, since the mathematics is initially given as text on the
> page, you need to be careful that your mathematics doesn’t look like
> HTML tags to the browser (which parses the page before MathJax gets to
> see it). In particular, that means that you have to be careful about
> things like less-than and greater-than signs (< and >), and ampersands
> (&), which have special meaning to the browsers. For example,
>
> ... when $x<y$ we have ...
>
> will cause a problem, because the browser will think <y is the
> beginning of a tag named y (even though there is no such tag in
> HTML)."
>
> See
>
>        http://docs.mathjax.org/en/latest/tex.html
>
> the section entitled "TeX and LaTeX in HTML documents":