In the dirac equation we have a term which is proportional to [tex] \alpha p [/tex]. In the book they say that(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \alpha [/tex] must be an hermitian operator in order for the Hamiltonian to be hermitian.

As I understand, we require this because we want [tex] (\alpha p)^\dagger = \alpha p[/tex].

But [tex] (\alpha p)^\dagger = p^\dagger \alpha^\dagger = p \alpha [/tex], and so the order of the operators still change.

So if we just require both operators to be hermitian their product will still change if we take the hermitian conjugate.

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# I Hermitian operators

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