# Position operator in infinte vector space

1. Sep 30, 2008

### wakko101

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

Find an expression for <P|X|P> in terms of P(x) defined as <x|P> (and possibly P*(x) )

2. Relevant equations

X|P> = x|P>
Identity operator: integral of |x><x| dx

3. The attempt at a solution