this book lacks much rigor (many mistakes)

If you are an English speaker, please use an automated translation for my comment; Indeed my comment is about the french edition of this book. I suppose though equations That & schemes have-nots beens altered by the translation ... so how this may apply to the English versions of the book.

This scientific book contains too many mistakes, and some are quite rude. It's pretty annoying when you need a solid information base to work. It does unfortunately not show much rigor on the part of the author. Just two examples:
- Chapter 3, Equation 3.9: f (x) = x + x / c. c with the interest rate => false.
The correct function is f (x) = x + (cx / 100). In the example it takes (10% interest), the result is correct, but it was an accident ... x / x = 10 * 10/100
- Chapter 7, Figure 7.3: seen graphs sin² (wt) oscillate around 0. A square that takes a real negative values ​​... The author could have re-read ...