Is it possible to only change the math font in Beamer with XeLaTeX? The only partial solution I've been about to find is to create a new command:
\renewcommand\mathfamilydefault{\rmdefault}
The above command does essentially what I want, but it also strangely inserts characters (lmr) prior to maths. For example,
\mathfamilydefault{${x}_{ij} = -d_{k}/d_{0}$},
yields:


stillsansserifmath– Jan 19 '12 at 12:25