## Question

###### If $\mathrm{A}$ and $\mathrm{B}$ are diagonal, show that $\mathrm{A}$ and $\mathrm{B}$ commute.

If $\mathrm{A}$ and $\mathrm{B}$ are diagonal, show that $\mathrm{A}$ and $\mathrm{B}$ commute.

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