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1. The problem statement, all variables and given/known data

I have a question: Am I allowed to do the following, where the a's are operators and the alphas are quantum states.

[tex] \langle \alpha \mid a^\dagger a^\dagger a a \mid \alpha \rangle = \langle \alpha \mid a^\dagger a^\dagger \mid \alpha \rangle \langle \alpha \mid a a \mid \alpha \rangle[/tex]

Well, I think I am allowed to, but I'm not sure how to verify this.

Thanks for your help

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# Homework Help: Question to a calculation rule -> Dirac formalism

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