∂ t Ψ = ( α _ . p ^ _ − β m ) Ψ {\displaystyle {{\partial }_{t}}\Psi =\left({\underline {\alpha }}.{\underline {\hat {p}}}-\beta m\right)\Psi }
( γ μ ∂ μ − m ) Ψ = 0 {\displaystyle \left({{\gamma }^{\mu }}{{\partial }_{\mu }}-m\right)\Psi =0}
