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Oct 31, 2021 at 21:37 vote accept Gold
Oct 12, 2016 at 6:18 comment added Robin Ekman This is an excellent answer. One could add however that to the Dirac field there correspond 16 bilinear Hermitian observables $\bar\psi\Gamma\psi$ and at least some of them have simple interpretations: density of particles, total current, spin density...
Oct 11, 2016 at 23:41 history answered ACuriousMind CC BY-SA 3.0