- #1

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The question is to show that

<m|x|n>

Is zero unless m = n + or - 1

As I understand it so far <m| and |n> correspond to the eigenstates of an arbitrary system and x is just supposed to be the x operator

The only thing i could think to do with his was plug into

[tex]\int[/tex]m*xn dx but that did not help me

I also susspect i need to use that

<m|n>=[tex]\delta[/tex]

_{mn}

If anyone could give me a nudge in the correct direction it would be much appreciated.