Erratum to (9.57)

Erratum to (9.111) and (9.115)

 changing the symbol for the density operator from P to D in order to be consistent with (2.21)

Errata to (9.101), (9.102) and (9.104)

missing ^ on some of the excitation or de-excitation operators

Erratum to (9.93):

Erratum to (9.82): sign in exponential operator

Erratum to (9.59): change in variable from r to x

Erratum to (9.58): change in variable from r to x

Erratum to (9.37) & (9.38): error in index and missing hats

Erratum to (9.25):

Erratum to (9.21): change in variable from r to x

Erratum to (9.20): change in variable from r to x

Erratum to (9.17): change in variable from r to x