p.2: line 1, January 19 was a Monday in 1998, not a Friday

p.6: in Lemma 1.1, "Let u and v be integers, v not 0."

p.12: line 5, \bar{0} should be \bar{a}

p.16: exercise 1.7, (m,n)=1

p.92: line 7 from bottom, definition of centralizer should read "\alpha\xi\alpha^{-1} = \xi"

p.107: Formula 9.2, missing subscript in O_{x_i}

p.125: line 7 from bottom, last word should be "led"

p.132: Out[19]= { (4 6 5), (1 2 3) }

p.144: in line above Example 11.2, should be Exercise 10.17, not 4.17

p.151: in Theorem 12.2, should be K_{\sigma(i)+1}

p.274: in diagram, points should be labelled "Q_i" instead of "\zeta_i"