Properties of the Four-Component Spinor

We shall consider now the properties of the four-component spinor U   =   ( u v ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429492501/e6a0c676-1f8d-4684-97a0-6bf3353f7ce0/content/eq504.tif"/>