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## Homework Statement

In the derivation of the momentum operator: Why is this equal?

## Homework Equations

[PLAIN]http://img268.imageshack.us/img268/4575/momentumoperatorderivat.png [Broken]

## The Attempt at a Solution

I thought maybe the integral is executed, but the integral sign stays.

One p vanishes, the momentum operator itself shows up.

You would really expect this in a derivation of p, but dp stays.

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