Average Values in Terms of Lower-Order Distribution Functions

5 Average Values in Terms of Lower-Order Distribution Functions 

In this section we present some formulas and notation that will be very useful in subsequent sections, where averages with respect to the full phase space distribution are reduced to averages with respect to lower-order distribution functions. By formalizing the reduction procedure some economy of presentation can be achieved. For those not particularly interested in the mathematical details, the principal results are given in Eqs. (5.9), (5.10), (5.19) and (5.20). 

---