ABSTRACT
The Dirac equation possesses plane-wave solutions, i.e., solutions describing a single particle in the absence of interaction. We write () ψ ( r , t ) = u exp { − ip ν x ν ħ } https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429493645/749bab20-4a79-4f5a-8c66-d9e9a36a87b9/content/eq1804.tif"/>
