From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scot Becker <scot.becker@gmail.com>
Subject: Re: org-mode can not precess some LATEX environment
Date: Tue, 11 Aug 2009 10:34:20 +0100
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To: waterloo <waterloo2005@gmail.com>
Cc: emacs-orgmode@gnu.org, Carsten Dominik <carsten.dominik@gmail.com>

>
> `To avoid conflicts with currency specifications, single =91$=92 characte=
rs are
> only recognized as math delimiters if the enclosed text contains at most =
two
> line breaks, is directly attached to the =91$=92 characters with no white=
space
> in between, and if the closing =91$=92 is followed by whitespace, punctua=
tion or
> a dash. '
>

This lists a series of conditions for recognizing $ as a math
delimiter, instead of as a dollar sign.

Basically, if you want it recognized as a math delimiter:
1.  don't make the text you enclose have more than two linebreaks
2.  don't put whitespace between your math and the $
3.  don't follow your $ with anything but whitespace or punctuation.