TODO: in high level terms, why is QED more general than just solving the Dirac equation, and therefore explaining quantum electrodynamics experiments?

Also, is it just a bunch of differential equation (like the Dirac equation itself), or does it have some other more complicated mathematical formulation, as seems to be the case? Why do we need something more complicated than

Bibliography:

- https://physics.stackexchange.com/questions/101307/dirac-equation-in-qft-vs-relativistic-qm
By several reasons explained in textbooks, the Dirac equation is not a valid wavefunction equation. You can solve it and find solutions, but those solutions cannot be interpreted as wavefunctions for a particle

- https://physics.stackexchange.com/questions/64206/why-is-the-dirac-equation-not-used-for-calculations
- https://www.physicsforums.com/threads/is-diracs-equation-still-useful-after-qed-is-developed.663994/

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