[Orgmode] About entering latex code in an org file

[Curiouslearn]

Hi,

I am new to both emacs and org-mode. Org-mode sounds really cool and I
am trying to use it to make notes for a project. I have some latex
symbols that I need to enter in the file.
As a background:
(1) I read in the manual that for latex code I do not need to enclose
math inside $ $.
(2) I have many words with "_" in the their names, so as mentioned in
the manual, I added
#+OPTIONS: ^:{}
#+OPTIONS: _:{}
to my .org file.

In fact, the my file is
-----------------------------------------------------------------------------------------------------
#+OPTIONS: ^:{}
#+OPTIONS: _:{}
#+LATEX_HEADER: \setlength{\parskip}{2ex plus 0.5ex minus 0.2ex}
#+LATEX_HEADER: \setlength{\parindent}{0in}

* TODO Write an aspiration_review function
  The function should do the following:
  1. Investigates if \pi_{g}  \geq  0.05  and \bar{\pi} \geq  ASP_LEVEL


** Investigate if

-----------------------------------------------------------------------------------------------------
The problem is that when I export this using 'C-c C- e l' to latex,
some parts that should be enclosed in $ $ sign are not enclosed. This
is the relevant line copied and pasted from the exported .tex file

\item Investigates if $\pi$$_\{g\}$  \geq  0.05  and \bar{\pi} \geq
ASP\_{}LEVEL

Can someone please let me know what is happening?

Thanks very much for all those who have been working on org-mode.