Recovery of Dirac Equations from Their Solutions

We deal with quantum field theory in the restriction to external Bose fields. Let $(iγ^μ\partial_μ- \mathcal{B})ψ=0$ be the Dirac equation. We prove that a non-quantized Bose field $\mathcal{B}$ is a functional of the Dirac field $ψ$, whenever this $ψ$ is strictly canonical. Performing the trivial verification for the $\mathcal{B} := m =$ constant which yields the free Dirac field, we also prepare the tedious verifications for all $\mathcal{B}$ which are non-quantized and static. Such verifications must not be confused, however, with the easy and rigorous proof of our formula, which is shown in detail.

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