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-p.s3.eu-west-1.amazonaws.com/9780367811846/586bb8b4-394a-4d09-a69c-5a6773b07df4/content/eq56.tif"/>
