## Question

###### Make use of the matrix expression (13.18) for $x$ in a representation defined by the harmonic-oscillator wave functions to obtain a similar matrix for $x^{2}$, using purely matrix methods. Compare with the answer to Prob. 3, Chap. IV.

Make use of the matrix expression (13.18) for $x$ in a representation defined by the harmonic-oscillator wave functions to obtain a similar matrix for $x^{2}$, using purely matrix methods. Compare with the answer to Prob. 3, Chap. IV.

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