Entering partial derivatives?

[parisse]

(11-07-2014 12:14 PM)DrD Wrote:  I don't want to beat a dead horse, but could the use of an appended flag on the end of the 'where' command resolve the matter? example: "|{x=1,y=2},0" would indicate "eval before" or "|{x=1,y=2},1" "eval after?"

It's not very pretty and you would have to explain how evaluation is performed anyway, I prefer to stay with subst and |, with appropriate help (and links to | from subst help and conversly).