ABSTRACT
The nonequilibrium theory described in the previous chapters reduces to a particularly simple form for a system of fermions very close to zero temperature. To see this, let us define a “local occupation number” f (p,ω;R, T) by writing () g < ( p , ω ; R , T ) = a ( p , ω ; R , T ) f ( p , ω ; R , T ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429493218/2723bf93-af84-4d1d-955c-798a77ad6aa2/content/eq713.tif"/>
