One suggestion though:
Don't use x and y for vectors as those are typically used for individual coordinates in the Cartesian plane. So saying x=(0.75 \ 0.25) is a bit confusing as the intended audience is probably used to thinking of x=0.75 and y=0.25. Or say they would think of translating point p into point q where p would have coordinates (0.75,0.25) and q some other pair of x,y coordinates.
/my pointless comment for the day.
"The only intuitive interface is the nipple. After that, it's all learned." -- Unknown, possibly Bruce Ediger
There's a page about tracking down who said this: http://www.greenend.org.uk/rjk/misc/nipple.html