I set my font to sans serif via
\renewcommand{\familydefault}{\sfdefault}
\usepackage{helvet,sfmath}
Now I want to use some symbols -not all- (only normal letters or greek letters) from the standard computer modern math font in mathmode.
Unfortunatly neither
$\mathrm{w}$
nor
{\fontfamily{cmm}\selectfont $w$}
will give me the desired result.
I want to use it in a tikz-environment, but I guess that's no difference to the usual usage.
update:
I am a little confused about the fact, that I cannot change the font at all. Neither with the above mentioned selectfont-command nor in tikz via (for example)
\node[font=\rmfamily] at (0,0) {$w$};
