ABSTRACT
You are used to seeing the Dirac equation (or similarly the Schrödinger equation) written in the form ( i ∇ − A − m ) Ψ = 0 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429492501/e6a0c676-1f8d-4684-97a0-6bf3353f7ce0/content/eq667.tif"/>
