ABSTRACT
The identity ( θ u j + ( 1 − θ ) u A − u ) 2 ≡ θ ( u j − u ) 2 + ( 1 − θ ) ( u A − u ) 2 − θ ( 1 − θ ) ( u j − u A ) 2 https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780367811846/9aebcb79-b449-46c9-a365-e81d4d6a2239/content/eq56.tif"/>
