Hi Nick,
> Thanks for your reply. I updated my org to 7.5 and the $D$ worked inWorks fine here:
> the title. However, if I use \(D\) in the title, it says: undefined
> control sequence
>
> I tried \( ... \) in body, its OK.
>
--8<---------------cut here---------------start------------->8---
#+TITLE: This is a test for \(D\)
* foo
bar
--8<---------------cut here---------------end--------------->8---
What does the \title in the produced tex file look like? Mine looks
like this:
\title{This is a test for \(D\)}
and it compiles fine.
Nick