hi. I have been looking at a QM example in a book. It works out the expectation value for momentum which I know should be a real number but I can't see how or why the following number is real(adsbygoogle = window.adsbygoogle || []).push({});

α and β are complex numbers with | α |^{2}+ | β |^{2}= 1 and ω and t are real

-i ( α^{*}β e^{-iωt}-αβ^{*}e^{iωt})

Can anyone tell me if this is a real number and why?

Thanks

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# I Is this number real?

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