4. Consider a set of orthonormal eigenfunctions 4i of the operator 4 (where 4 = a, 9. ) and the so called "shift" operator x which has the effect of converting an eigenfunction to the next one in the series that is XPi = Pi+l %3D Calculate the expectation value of the observable associated with 4x for a system described by Y =Pi +P2 +P3
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