Stavros Macrakis <macrakis at gmail.com> writes: > multthru Thanks, this also works. Writing the expression as (K*R)^-1 * (K*R/sqrt(EXPR)-K*R) I now understand whu both expand and multthru do it. -- Piet van Oostrum <piet at vanoostrum.org> WWW: http://pietvanoostrum.com/ PGP key: [8DAE142BE17999C4]