Errors found in the fourth edition of the book
 Page 37 (Example 2.1)  A big thank to D. Klein.
The calculation of is wrong. The last paragraph of Example 2.1 should read as follows:
The last sentence of paragraph following example 2.1 is revised as follows:
 Page 54 (Equation 2.4.6)  A big thank to Nilden Tutalar.
Equation 2.4.6 is erroneous (the denominator in the expression of pe is (q1), and not q*(q1) as specified in the book). The correct equation is the following:
 Page 253 (Figure 9.4.7)
Figure 9.4.7 in the book is incorrect.. The correct figure is the following:
 Page 282 (last bullet point)
"... the summation by M/n  r." must be replaced with
"... the summation by M  rn."

