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## Homework Statement

I need to prove that, [tex]<p'|\hat{x}p> = i\hbar\frac{d}{dp'}\delta{p-p'}[/tex]

i.e. find the position operator in the momentum basis p for p'...

It's easy to prove that [tex]<x'|\hat{x}x> = <\hat{x}x'|x> = x'<x'|x> = x'\delta{x-x'}[/tex]

(position operator in position basis for x')

since I can use the fact that the operator x is hermitian. But what about for the first problem? Any hints?

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