How can I prove that the eigenvalues of the operator ## i\gamma^\mu \partial_\mu ## are non-negative?(adsbygoogle = window.adsbygoogle || []).push({});

I've tried using the ansatz ## \psi=u(p) e^{ip_\nu x^\nu} ## but it didn't help.

I've also tried playing with the equation using the properties of gamma matrices but that doesn't seem to lead anywhere too.

Thanks

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# A Non-negativity of the eigenvalues of the Dirac operator

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