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## Main Question or Discussion Point

If you have some wave function of some particle, say...

|¥>

And you calculate the expectation value of momentum, say...

<¥|p|¥>

What ensures that that spatial integral is real valued?

Separately, all the components of the integral are complex valued

|¥>

And you calculate the expectation value of momentum, say...

<¥|p|¥>

What ensures that that spatial integral is real valued?

Separately, all the components of the integral are complex valued