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How can I prove that the eigenvalues of the operator ## i\gamma^\mu \partial_\mu ## are non-negative?
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
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