Parametric VE explained

This is an explanation, representation, and pros & cons of the Parametric VE.
I was told to cut it out with the math, so here it is watered down for easy reading. I kept the math simple, I might have mentioned matrix multiplication once, but I think I got away with it.

It's way too involved to be a web page so here's the downloads:

Word2007 version PDF version

enjoy and for the love of Newton, please comment profusely,
Marcin