Paul Smith <phhs80 <at> gmail.com> writes:
>
> Thanks, Paul. It works when the equation is in inline style, but not
> when in display style -- an error is generated while producing the pdf
> file. Any ideas?
It's a bit complicated to explain. Here's the key sequence (again using the
xcolor package):
1. Insert > Math > Display Formula.
2. (in the math inset) Type '\fcolorbox\{'.
3. The '\{' creates an inset where you type 'black'.
4. Move the cursor just outside '{black}', type '\{' again, and fill in 'red'.
5. Move the cursor just outside '{red}' and type '\{\ensuremath' followed by a
space. The function name will disappear and you'll have yet another inset.
6. Type your formula in the last inset and exit the display formula.
Paul
