% These are not known by LyX but work nevertheless:
empheq
\end{mathenvironments}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Sweave stuff
+\Sexpr{}
+\SweaveOpts{}
+\SweaveInput{}
+\SweaveSyntax{}
+\Scoderef{}
+
+\Rcode{}
+\Robject{}
+\Rcommand{}
+\Rfunction{}
+\Rfunarg{}
+\Rpackage{}
+\Rclass{}
+\Rmethod{}