I don't actually remember, it's been a while. I do remember that it's not completely explained - he does skip steps (and that's not just me, I read that in a review of the book). I also remember getting confused and frustrated. I bought the book with high hopes and put more than a little bit of effort into it, but eventually I gave it away to someone who knew more math.

I suppose I could go take it out of the library and try again.