Formula (11.31)

In the A_k term in the interaction term of the first line k should be replaced by k'.

Formula (11.60)

The prime is missing for the c operator in the J term of the equation.

Formula (11.62)

The prime is missing for the c operator in the J term of the equation.

Page 356, below formula (11.64)

One should read

Formula (11.82)

should be replaced by

Formula (11.83)

should be replaced by

Formula (11.104)

should be replaced by

Formula (11.106)

should be replaced by