[texhax] extracting math from pdf file

[Benjamin Sambale]

Dear forum,

consider the following code:

\documentclass{minimal}
\begin{document}
$\ne$
\end{document}

I compiled this code using pdflatex (TeX Live 2010). If I try to copy 
the \ne-symbol in the corresponding pdf-file with the mouse cursor, I 
get an equality-sgin (=) instead. I only tried this with evince as pdf 
viewer, but I suspect that the behavior is similar for other viewers. I 
also tried to use something like

\pdfglyphtounicode{notequal}{...}

without success. I'm very grateful for any ideas.

Best wishes,
Benjamin