[OS X Emacs] Abbrevs

[Jan Rosinski]

I was trying to define, unsuccessfully, abbrev of \frac{}{} to be  
triggered by \f
with the cursor between the first braces at the end, in the local  
latex mode.
I can do it with fr as a trigger but \f does not work.
Eventually, I would like to have several such abbrevs for the math. Is  
it possible with
the prefix \ ? If not, what is the best solution? Concrete examples  
are the best. Thanks.

Jan