Re: How to use \subsetneqq in Org-mode?

[Alexis <flexibeast@gmail.com>]

杨劲松 <shannleon@gmail.com> writes:

> Thank you Alexis and Kaushal. I might mislead you.
>
> I am writing some short articles which includes a lot of Math
> formula. So I include LaTeX command here and there like $A 
> \subset
> B$. Most symbol display OK when exporting to HTML. But the 
> \subsetneqq
> not. Same article, Html couldn't handle $\subsetneqq$ and 
> display
> "Undefined control sequence \subsetneqq" in final render. But 
> display
> in PDF output correctly.

Yes, because as we noted, \subsetneqq is not a LaTeX command that 
Org
understands. When exporting to PDF, your article gets processed by 
a
LaTeX program (e.g. pdflatex; but it might be something different 
on
your system), which understands what \subseqneqq is, so it's able 
to
produce the correct output in the PDF. But when exporting to HTML, 
as
explained by Kaushal, exporting uses a list built-in to Org (which 
you
can view with M-x org-entities-help) in order to produce HTML 
output. It
seems most of the math symbols you use are in that list, but 
\subsetneqq
is not, so you don't get the correct symbol in your output.

Thus, Kaushal suggested that you send an email to the Org people 
asking
if \subsetneqq can be added to the list. In the meantime, however, 
you
can simply add the symbol directly into your article, by using the
method i described; instead of typing \subsetneqq, type:

    C-x 8 RET SUBSET OF ABOVE NOT EQUAL

which will insert the symbol into your article. Whether it 
displays in
your Emacs buffer depends on whether the font you use in Emacs 
includes
that symbol. Also note that whether it displays in a browser will 
depend
on whether the user viewing it is using a font that includes that
symbol.

Hope that makes things clearer!


Alexis.