org latex/beamer math escape in a ``surrounding context'': $a$'s

[Martin Steffen <msteffen@ifi.uio.no>]

Hi, I'd to have some math in beamer/latex. In LaTeX I'd write

               $a$'s

The a is the math, the apostroph-s is the surrounding text. Math-escape
works fine in org, but it seems the $ -- $ must be surrounded by blanks.
In the above example, exporting to latex/beamer does not give the desired
result. The immediately trailing "'s" get the $-signs interpreted
verbatimely. Same applies for other surrounding contexts like

   ``$a$''  $a$s 

but ($a$) and "$a$" do a math-escape. Is there a solution for the above (I
don't want to write  $a$ 's)? Or is there a rationale behind that, so I know
when to except an escape and when no?

Martin